Subject Categories

Descriptors grouped under broad subject categories

ADMINISTRATIVE AND GOVERNMENT LAW

  • Accounting Descriptor
  • Administrative practice and procedure Descriptor
  • Advisory committees Descriptor
  • Archives and records Descriptor
  • Authority delegations (Government agencies) Descriptor
  • Campaign funds Descriptor
  • Census data Descriptor
  • Conflict of interests Descriptor
  • Decorations, medals, awards Descriptor
  • Disaster assistance Descriptor
  • Elections Descriptor
  • Emergency powers Descriptor
  • Equal access to justice Descriptor
  • Executive orders Descriptor
  • Federal buildings and facilities Descriptor
  • Federally affected areas Descriptor
  • Flags Descriptor
  • Freedom of information Descriptor
  • Government contracts Descriptor
  • Government employees Descriptor
  • Government procurement Descriptor
  • Government property Descriptor
  • Government property management Descriptor
  • Government publications Descriptor
  • Government securities Descriptor
  • Grant programs Descriptor
  • Grants administration Descriptor
  • Holidays Descriptor
  • Indemnity payments Descriptor
  • Intergovernmental relations Descriptor
  • Investigations Descriptor
  • Loan programs Descriptor
  • Lobbying Descriptor
  • Organization and functions (Government agencies) Descriptor
  • Political activities (Government employees) Descriptor
  • Political candidates Descriptor
  • Political committees and parties Descriptor
  • Presidential documents Descriptor
  • Privacy Descriptor
  • Proclamations Descriptor
  • Reporting and recordkeeping requirements Descriptor
  • Revenue sharing Descriptor
  • Seals and insignia Descriptor
  • Security measures Descriptor
  • State and local governments Descriptor
  • Statistics Descriptor
  • Sunshine Act Descriptor
  • Surplus government property Descriptor
  • Technical assistance Descriptor
  • Time Descriptor
  • Uniform System of Accounts Descriptor
  • Voting rights Descriptor
  • Whistleblowing Descriptor
  • AGRICULTURE AND FOOD LAW

    • Acreage allotments Descriptor
    • Agricultural commodities Descriptor
    • Agricultural research Descriptor
    • Agriculture Descriptor
    • Alcohol and alcoholic beverages Descriptor
    • Animal biologics Descriptor
    • Animal diseases Descriptor
    • Animal drugs Descriptor
    • Animal feeds Descriptor
    • Animal foods Descriptor
    • Animal welfare Descriptor
    • Animals Descriptor
    • Bakery products Descriptor
    • Beer Descriptor
    • Bees Descriptor
    • Beverages Descriptor
    • Cacao products Descriptor
    • Cereals (food) Descriptor
    • Chemicals Descriptor
    • Cigars and cigarettes Descriptor
    • Citrus fruits Descriptor
    • Coffee Descriptor
    • Color additives Descriptor
    • Commodity futures Descriptor
    • Cooperatives Descriptor
    • Cottonseeds Descriptor
    • Crop insurance Descriptor
    • Dairy products Descriptor
    • Dietary foods Descriptor
    • Feed grains Descriptor
    • Fertilizers Descriptor
    • Food additives Descriptor
    • Food assistance programs Descriptor
    • Food grades and standards Descriptor
    • Food labeling Descriptor
    • Food packaging Descriptor
    • Food stamps Descriptor
    • Foods Descriptor
    • Forests and forest products Descriptor
    • Frozen foods Descriptor
    • Fruit juices Descriptor
    • Fruits Descriptor
    • Grain sorghum Descriptor
    • Grains Descriptor
    • Hogs Descriptor
    • Irrigation Descriptor
    • Liquors Descriptor
    • Livestock Descriptor
    • Margarine Descriptor
    • Marketing agreements Descriptor
    • Marketing quotas Descriptor
    • Meat and meat products Descriptor
    • Meat inspection Descriptor
    • Migrant labor Descriptor
    • Milk Descriptor
    • Milk marketing orders Descriptor
    • Nursery stock Descriptor
    • Nuts Descriptor
    • Oils and fats Descriptor
    • Oilseeds Descriptor
    • Pesticides and pests Descriptor
    • Pets Descriptor
    • Plant diseases and pests Descriptor
    • Plants Descriptor
    • Poultry and poultry products Descriptor
    • Price support programs Descriptor
    • Range management Descriptor
    • Rural areas Descriptor
    • School breakfast and lunch programs Descriptor
    • Seafood Descriptor
    • Seeds Descriptor
    • Soil conservation Descriptor
    • Spices and flavorings Descriptor
    • Stockyards Descriptor
    • Sugar Descriptor
    • Surplus agricultural commodities Descriptor
    • Tea Descriptor
    • Tobacco Descriptor
    • Vegetable juices Descriptor
    • Vegetables Descriptor
    • Veterinarians Descriptor
    • Wine Descriptor
    • COMMERCIAL LAW

    • Accountants Descriptor
    • Accounting Descriptor
    • Advertising Descriptor
    • Antidumping Descriptor
    • Antitrust Descriptor
    • Bank deposit insurance Descriptor
    • Bankruptcy Descriptor
    • Banks, banking Descriptor
    • Bonds Descriptor
    • Brokers Descriptor
    • Business and industry Descriptor
    • Clothing Descriptor
    • Commodity futures Descriptor
    • Common carriers Descriptor
    • Communications common carriers Descriptor
    • Concessions Descriptor
    • Confidential business information Descriptor
    • Consumer protection Descriptor
    • Countervailing duties Descriptor
    • Credit Descriptor
    • Credit unions Descriptor
    • Crime insurance Descriptor
    • Crop insurance Descriptor
    • Currency Descriptor
    • Customs duties and inspection Descriptor
    • Economic statistics Descriptor
    • Electronic funds transfers Descriptor
    • Employment taxes Descriptor
    • Estate taxes Descriptor
    • Estates Descriptor
    • Excise taxes Descriptor
    • Exports Descriptor
    • Fairs and expositions Descriptor
    • Federal home loan banks Descriptor
    • Federal Reserve System Descriptor
    • Flood insurance Descriptor
    • Footwear Descriptor
    • Foreign banking Descriptor
    • Foreign currencies Descriptor
    • Foreign investments in U. S. Descriptor
    • Foreign trade Descriptor
    • Foreign trade zones Descriptor
    • Gift taxes Descriptor
    • Glass and glass products Descriptor
    • Gold Descriptor
    • Government securities Descriptor
    • Health insurance Descriptor
    • Holding companies Descriptor
    • Household appliances Descriptor
    • Imports Descriptor
    • Income taxes Descriptor
    • Indians-business and finance Descriptor
    • Insurance Descriptor
    • Insurance companies Descriptor
    • Investment companies Descriptor
    • Investments Descriptor
    • Labeling Descriptor
    • Life insurance Descriptor
    • Loan programs Descriptor
    • Minority businesses Descriptor
    • Mortgage insurance Descriptor
    • Mortgages Descriptor
    • National banks Descriptor
    • Oil imports Descriptor
    • Packaging and containers Descriptor
    • Petroleum price regulations Descriptor
    • Plastics materials and synthetics Descriptor
    • Price controls Descriptor
    • Revenue sharing Descriptor
    • Rubber and rubber products Descriptor
    • Savings associations Descriptor
    • Securities Descriptor
    • Silver Descriptor
    • Small businesses Descriptor
    • Surety bonds Descriptor
    • Tax treaties Descriptor
    • Taxes Descriptor
    • Textiles Descriptor
    • Trade adjustment assistance Descriptor
    • Trade agreements Descriptor
    • Trade names Descriptor
    • Trade practices Descriptor
    • Trademarks Descriptor
    • Trusts and trustees Descriptor
    • Truth in lending Descriptor
    • Truth in savings Descriptor
    • Uniform System of Accounts Descriptor
    • United States investments abroad Descriptor
    • Utilities Descriptor
    • Voluntary standards Descriptor
    • War risk insurance Descriptor
    • Warehouses Descriptor
    • Warranties Descriptor
    • Whistleblowing Descriptor
    • COMMUNICATIONS LAW

    • Cable television Descriptor
    • Communications Descriptor
    • Communications common carriers Descriptor
    • Communications equipment Descriptor
    • Defense communications Descriptor
    • Motion pictures Descriptor
    • News media Descriptor
    • Newspapers and magazines Descriptor
    • Postal Service Descriptor
    • Radio Descriptor
    • Recordings Descriptor
    • Signs and symbols Descriptor
    • Telecommunications Descriptor
    • Telegraph Descriptor
    • Telephone Descriptor
    • Television Descriptor
    • EDUCATION LAW

    • Adult education Descriptor
    • Art Descriptor
    • Arts and crafts Descriptor
    • Bilingual education Descriptor
    • Colleges and universities Descriptor
    • Cultural exchange programs Descriptor
    • Education Descriptor
    • Education of disadvantaged Descriptor
    • Education of individuals with disabilities Descriptor
    • Educational facilities Descriptor
    • Educational research Descriptor
    • Educational study programs Descriptor
    • Elementary and secondary education Descriptor
    • Equal educational opportunity Descriptor
    • Indians-arts and crafts Descriptor
    • Indians-education Descriptor
    • Libraries Descriptor
    • Medical and dental schools Descriptor
    • Military academies Descriptor
    • Museums Descriptor
    • Music Descriptor
    • Private schools Descriptor
    • Scholarships and fellowships Descriptor
    • School breakfast and lunch programs Descriptor
    • School construction Descriptor
    • Schools Descriptor
    • Student aid Descriptor
    • Students Descriptor
    • Teachers Descriptor
    • Vocational education Descriptor
    • ENERGY LAW

    • Coal Descriptor
    • Coal conversion program Descriptor
    • Electric power Descriptor
    • Electric power plants Descriptor
    • Electric power rates Descriptor
    • Electric utilities Descriptor
    • Energy Descriptor
    • Energy conservation Descriptor
    • Fuel additives Descriptor
    • Fuel economy Descriptor
    • Gasohol Descriptor
    • Gasoline Descriptor
    • Geothermal energy Descriptor
    • Natural gas Descriptor
    • Nuclear energy Descriptor
    • Nuclear materials Descriptor
    • Nuclear power plants and reactors Descriptor
    • Oil and gas exploration Descriptor
    • Oil and gas reserves Descriptor
    • Oil imports Descriptor
    • Petroleum Descriptor
    • Petroleum allocation Descriptor
    • Petroleum price regulations Descriptor
    • Pipelines Descriptor
    • Solar energy Descriptor
    • Utilities Descriptor
    • ENVIRONMENT LAW

    • Acid rain Descriptor
    • Air pollution control Descriptor
    • Environmental impact statements Descriptor
    • Environmental protection Descriptor
    • Hazardous waste Descriptor
    • Motor vehicle pollution Descriptor
    • Noise control Descriptor
    • Oil pollution Descriptor
    • Pesticides and pests Descriptor
    • Recycling Descriptor
    • Sewage disposal Descriptor
    • Superfund Descriptor
    • Waste treatment and disposal Descriptor
    • Water pollution control Descriptor
    • INTERNATIONAL RELATIONS

    • Alien property Descriptor
    • Aliens Descriptor
    • Antidumping Descriptor
    • Boycotts Descriptor
    • Citizenship and naturalization Descriptor
    • Countervailing duties Descriptor
    • Cultural exchange programs Descriptor
    • Customs duties and inspection Descriptor
    • Exports Descriptor
    • Fairs and expositions Descriptor
    • Foreign aid Descriptor
    • Foreign claims Descriptor
    • Foreign officials Descriptor
    • Foreign relations Descriptor
    • Foreign Service Descriptor
    • Foreign trade Descriptor
    • Foreign trade zones Descriptor
    • Immigration Descriptor
    • Imports Descriptor
    • International boundaries Descriptor
    • International organizations Descriptor
    • Oil imports Descriptor
    • Passports and visas Descriptor
    • Refugees Descriptor
    • Tax treaties Descriptor
    • Trade adjustment assistance Descriptor
    • Trade agreements Descriptor
    • Treaties Descriptor
    • War claims Descriptor
    • HEALTH AND SAFETY LAW

    • Alcohol abuse Descriptor
    • Alcoholism Descriptor
    • Animal biologics Descriptor
    • Animal diseases Descriptor
    • Animal drugs Descriptor
    • Antibiotics Descriptor
    • Aviation safety Descriptor
    • Biologics Descriptor
    • Black lung benefits Descriptor
    • Blind Descriptor
    • Blood Descriptor
    • Blood diseases Descriptor
    • Cancer Descriptor
    • Chemicals Descriptor
    • Color additives Descriptor
    • Communicable diseases Descriptor
    • Cosmetics Descriptor
    • Dental health Descriptor
    • Drug abuse Descriptor
    • Drug testing Descriptor
    • Drugs Descriptor
    • Emergency medical services Descriptor
    • Explosives Descriptor
    • Family planning Descriptor
    • Fire prevention Descriptor
    • Flammable materials Descriptor
    • Genetic diseases Descriptor
    • Hazardous substances Descriptor
    • Hazardous waste Descriptor
    • Health Descriptor
    • Health care Descriptor
    • Health facilities Descriptor
    • Health insurance Descriptor
    • Health maintenance organizations (HMO) Descriptor
    • Health professions Descriptor
    • Health records Descriptor
    • Health statistics Descriptor
    • Heart diseases Descriptor
    • Highway safety Descriptor
    • HIV/AIDS Descriptor
    • Hospice care Descriptor
    • Hospitals Descriptor
    • Immunization Descriptor
    • Individuals with disabilities Descriptor
    • Kidney diseases Descriptor
    • Lead poisoning Descriptor
    • Leprosy (Hansen’s disease) Descriptor
    • Lung diseases Descriptor
    • Marine safety Descriptor
    • Maternal and child health Descriptor
    • Medicaid Descriptor
    • Medical and dental schools Descriptor
    • Medical devices Descriptor
    • Medical research Descriptor
    • Medicare Descriptor
    • Mental health programs Descriptor
    • Mine safety and health Descriptor
    • Motor vehicle safety Descriptor
    • Nursing homes Descriptor
    • Nutrition Descriptor
    • Occupational safety and health Descriptor
    • Over-the-counter drugs Descriptor
    • Peer Review Organizations (PRO) Descriptor
    • Pipeline safety Descriptor
    • Poison prevention Descriptor
    • Prescription drugs Descriptor
    • Public health Descriptor
    • Quarantine Descriptor
    • Radiation protection Descriptor
    • Radioactive materials Descriptor
    • Railroad safety Descriptor
    • Safety Descriptor
    • Smoking Descriptor
    • Venereal diseases Descriptor
    • Veterinarians Descriptor
    • HOUSING AND COMMUNITY DEVELOPMENT

    • Buildings and facilities Descriptor
    • Community development Descriptor
    • Community development block grants Descriptor
    • Community facilities Descriptor
    • Condominiums Descriptor
    • Cooperatives Descriptor
    • Fair housing Descriptor
    • Home improvement Descriptor
    • Homeless Descriptor
    • Housing Descriptor
    • Housing standards Descriptor
    • Land sales Descriptor
    • Low and moderate income housing Descriptor
    • Manufactured homes Descriptor
    • Mortgage insurance Descriptor
    • Mortgages Descriptor
    • Public housing Descriptor
    • Real property acquisition Descriptor
    • Relocation assistance Descriptor
    • Rent subsidies Descriptor
    • Seismic safety Descriptor
    • Urban areas Descriptor
    • Urban renewal Descriptor
    • Zoning Descriptor
    • EMPLOYMENT AND LABOR LAW

    • Child labor Descriptor
    • Disability benefits Descriptor
    • Employee benefit plans Descriptor
    • Employment Descriptor
    • Equal employment opportunity Descriptor
    • Government employees Descriptor
    • Homeworkers Descriptor
    • Job Corps Descriptor
    • Labor Descriptor
    • Labor management relations Descriptor
    • Labor unions Descriptor
    • Manpower Descriptor
    • Manpower training programs Descriptor
    • Migrant labor Descriptor
    • Minimum wages Descriptor
    • Occupational safety and health Descriptor
    • Old-age, Survivors and Disability Insurance Descriptor
    • Pension insurance Descriptor
    • Pensions Descriptor
    • Railroad retirement Descriptor
    • Railroad unemployment insurance Descriptor
    • Retirement Descriptor
    • Social security Descriptor
    • Unemployment compensation Descriptor
    • Wages Descriptor
    • Work Incentive Programs (WIN) Descriptor
    • Workers’ compensation Descriptor
    • LAW IN GENERAL

    • Alimony Descriptor
    • Civil disorders Descriptor
    • Civil rights Descriptor
    • Claims Descriptor
    • Clemency Descriptor
    • Copyright Descriptor
    • Counterfeiting Descriptor
    • Courts Descriptor
    • Crime Descriptor
    • Drug traffic control Descriptor
    • Equal educational opportunity Descriptor
    • Equal employment opportunity Descriptor
    • Fair housing Descriptor
    • Federal Prison Industries Descriptor
    • Foreign claims Descriptor
    • Forgery Descriptor
    • Fraud Descriptor
    • Gambling Descriptor
    • Indians-claims Descriptor
    • Indians-enrollment Descriptor
    • Indians-judgment funds Descriptor
    • Indians-law Descriptor
    • Indians-tribal government Descriptor
    • Investigations Descriptor
    • Juvenile delinquency Descriptor
    • Law Descriptor
    • Law enforcement Descriptor
    • Law enforcement officers Descriptor
    • Lawyers Descriptor
    • Legal services Descriptor
    • Lie detector tests Descriptor
    • Lotteries Descriptor
    • Marital status discrimination Descriptor
    • Military law Descriptor
    • Penalties Descriptor
    • Political affiliation discrimination Descriptor
    • Prisoners Descriptor
    • Prisons Descriptor
    • Privacy Descriptor
    • Probation and parole Descriptor
    • Religious discrimination Descriptor
    • Rights-of-way Descriptor
    • Search warrants Descriptor
    • Seizures and forfeitures Descriptor
    • Sex discrimination Descriptor
    • Voting rights Descriptor
    • War claims Descriptor
    • Wiretapping and electronic surveillance Descriptor
    • GROUPS

    • Accountants Descriptor
    • Aged Descriptor
    • Air traffic controllers Descriptor
    • Airmen Descriptor
    • Aliens Descriptor
    • Blind Descriptor
    • Brokers Descriptor
    • Chaplains Descriptor
    • Child labor Descriptor
    • Conscientious objectors Descriptor
    • Engineers Descriptor
    • Firefighters Descriptor
    • Foreign officials Descriptor
    • Foundations Descriptor
    • Government employees Descriptor
    • Hawaiian Natives Descriptor
    • Health professions Descriptor
    • Homeless Descriptor
    • Homeworkers Descriptor
    • Hostages Descriptor
    • Human research subjects Descriptor
    • Indians Descriptor
    • Individuals with disabilities Descriptor
    • Infants and children Descriptor
    • Law enforcement officers Descriptor
    • Lawyers Descriptor
    • Longshore and harbor workers Descriptor
    • Migrant labor Descriptor
    • Military personnel Descriptor
    • Miners Descriptor
    • Nonprofit organizations Descriptor
    • Prisoners Descriptor
    • Prisoners of war Descriptor
    • Railroad employees Descriptor
    • Refugees Descriptor
    • Scientists Descriptor
    • Seamen Descriptor
    • Students Descriptor
    • Teachers Descriptor
    • Veterans Descriptor
    • Veterinarians Descriptor
    • Volunteers Descriptor
    • Women Descriptor
    • Youth Descriptor
    • MILITARY AND WAR LAW

    • Armed forces Descriptor
    • Armed forces reserves Descriptor
    • Arms and munitions Descriptor
    • Civil defense Descriptor
    • Classified information Descriptor
    • Conscientious objectors Descriptor
    • Defense communications Descriptor
    • Emergency powers Descriptor
    • Military academies Descriptor
    • Military air transportation Descriptor
    • Military law Descriptor
    • Military personnel Descriptor
    • National defense Descriptor
    • Prisoners of war Descriptor
    • Selective service system Descriptor
    • Strategic and critical materials Descriptor
    • Veterans Descriptor
    • NATURAL RESOURCES LAW

    • Coastal zone Descriptor
    • Continental shelf Descriptor
    • Dams Descriptor
    • Endangered and threatened species Descriptor
    • Fish Descriptor
    • Fisheries Descriptor
    • Flood control Descriptor
    • Flood plains Descriptor
    • Forests and forest products Descriptor
    • Gases Descriptor
    • Grazing lands Descriptor
    • Historic preservation Descriptor
    • Homesteads Descriptor
    • Indians-lands Descriptor
    • Marine mammals Descriptor
    • Marine resources Descriptor
    • Metals Descriptor
    • Mineral resources Descriptor
    • Mineral royalties Descriptor
    • Mines Descriptor
    • Monuments and memorials Descriptor
    • National forests Descriptor
    • National parks Descriptor
    • Natural resources Descriptor
    • Oil and gas reserves Descriptor
    • Public lands Descriptor
    • Public lands-classification Descriptor
    • Public lands-grants Descriptor
    • Public lands-mineral resources Descriptor
    • Public lands-rights-of-way Descriptor
    • Public lands-sale Descriptor
    • Public lands-withdrawal Descriptor
    • Reclamation Descriptor
    • Reservoirs Descriptor
    • Soil conservation Descriptor
    • Surface mining Descriptor
    • Underground mining Descriptor
    • Utilities Descriptor
    • Water bank program Descriptor
    • Water resources Descriptor
    • Water supply Descriptor
    • Watersheds Descriptor
    • Wildlife Descriptor
    • Wildlife refuges Descriptor
    • RECREATION

    • Bicycles Descriptor
    • Fishing Descriptor
    • Hobbies Descriptor
    • Hunting Descriptor
    • National trails system Descriptor
    • National wild and scenic rivers system Descriptor
    • Recreation and recreation areas Descriptor
    • Rivers Descriptor
    • Seashores Descriptor
    • Wilderness areas Descriptor
    • SCIENCE AND TECHNOLOGY

    • Agricultural research Descriptor
    • Computer technology Descriptor
    • Educational research Descriptor
    • Electronic products Descriptor
    • Human research subjects Descriptor
    • Inventions and patents Descriptor
    • Laboratories Descriptor
    • Lasers Descriptor
    • Measurement standards Descriptor
    • Medical research Descriptor
    • Metric system Descriptor
    • Micrographics Descriptor
    • Research Descriptor
    • Satellites Descriptor
    • Science and technology Descriptor
    • Scientific equipment Descriptor
    • Scientists Descriptor
    • Space transportation and exploration Descriptor
    • Weather Descriptor
    • X-rays Descriptor
    • SOCIAL LEGISLATION

    • Adoption and foster care Descriptor
    • Aid to Families with Dependent Children Descriptor
    • Child support Descriptor
    • Child welfare Descriptor
    • Community action programs Descriptor
    • Day care Descriptor
    • Family planning Descriptor
    • Food assistance programs Descriptor
    • Food stamps Descriptor
    • Medicaid Descriptor
    • Old-age, Survivors and Disability Insurance Descriptor
    • Public assistance programs Descriptor
    • School breakfast and lunch programs Descriptor
    • Social security Descriptor
    • Supplemental Security Income (SSI) Descriptor
    • Vocational rehabilitation Descriptor
    • TRANSPORTATION Descriptor

    • Air carriers Descriptor
    • Air rates and fares Descriptor
    • Air taxis Descriptor
    • Air traffic control Descriptor
    • Air traffic controllers Descriptor
    • Air transportation Descriptor
    • Aircraft Descriptor
    • Airmen Descriptor
    • Airports Descriptor
    • Airspace Descriptor
    • Anchorage grounds Descriptor
    • Aviation safety Descriptor
    • Bicycles Descriptor
    • Bridges Descriptor
    • Buses Descriptor
    • Cargo vessels Descriptor
    • Carpools Descriptor
    • Charter flights Descriptor
    • Common carriers Descriptor
    • Fishing vessels Descriptor
    • Freight Descriptor
    • Freight forwarders Descriptor
    • Harbors Descriptor
    • Hazardous materials transportation Descriptor
    • Highway safety Descriptor
    • Highways and roads Descriptor
    • Intermodal transportation Descriptor
    • Longshore and harbor workers Descriptor
    • Marine safety Descriptor
    • Maritime carriers Descriptor
    • Mass transportation Descriptor
    • Military air transportation Descriptor
    • Motor carriers Descriptor
    • Motor vehicle pollution Descriptor
    • Motor vehicle safety Descriptor
    • Motor vehicles Descriptor
    • Moving of household goods Descriptor
    • Navigation (air) Descriptor
    • Navigation (water) Descriptor
    • Noise control Descriptor
    • Nuclear vessels Descriptor
    • Oceanographic research vessels Descriptor
    • Parking Descriptor
    • Passenger vessels Descriptor
    • Passports and visas Descriptor
    • Pipeline safety Descriptor
    • Pipelines Descriptor
    • Railroad employees Descriptor
    • Railroad safety Descriptor
    • Railroads Descriptor
    • Rivers Descriptor
    • Seamen Descriptor
    • Space transportation and exploration Descriptor
    • Traffic regulations Descriptor
    • Transportation Descriptor
    • Travel Descriptor
    • Travel and transportation expenses Descriptor
    • Travel restrictions Descriptor
    • Vessels Descriptor

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