Superintendent of Documents Classification (SuDoc) Outline
| A | = | Agriculture, Forestry, Entomology, Nutrition, Conservation, Animal Science, Rural Studies |
| AC | = | Arms Control |
| AE | = | Archives, Laws, Regulations |
| C | = | Commerce, Fisheries, Patents, Trademarks, Census, Standards, Meteorology, Telecommunications, Oceanography |
| CC | = | Communications |
| CR | = | Civil Rights |
| D | = | Defense, Engineering, History, Warfare, Medicine (formerly W, N or M) |
| E | = | Energy |
| ED | = | Education |
| EP | = | Environment |
| FA | = | Fine Arts |
| FEM | = | Emergency Management |
| FHL | = | Home Loans |
| FM | = | Mediation |
| FMC | = | Merchant Marine |
| FR | = | Federal Reserve Bank |
| FT | = | Trade Regulations |
| GA | = | Accounting Regulations, Government Studies |
| GP | = | Printing, Publications, Libraries |
| GS | = | Procurement Regulations |
| HE | = | Public Health, Human Services, Food/Drug Regulations, Children, Aging, Medicine, Nutrition (formerly FS) |
| HH | = | Housing, Urban Development, Urban Planning |
| I | = | Parks, Railroads, Indian Affairs, Geology, Mines, Wildlife, Historic Preservation, Geography |
| IC | = | Interstate Commerce Regulations |
| ITC | = | International Trade Regulations |
| J | = | Criminal Justice, Drug Enforcement, Prisons, Immigration, Law Enforcement |
| JU | = | Courts, Legal Decisions |
| L | = | Labor, Occupational Safety, Unemployment, Training, Mine Safety, Compensation |
| LC | = | Libraries, Maps, Photographs, Copyrights, Rare Books, Motion Pictures, Folklife, Music |
| LR | = | Labor Relations |
| NA | = | Scientific Councils |
| NAS | = | Space, Aeronautics, Astronomy |
| NC | = | U. S. Capital |
| NCU | = | Credit Unions |
| NF | = | Arts and Humanities, Museums |
| NMB | = | Mediation |
| NS | = | Sciences |
| OP | = | Overseas Investment |
| P | = | Post Office |
| PE | = | Peace Corps |
| PM | = | Personnel Management |
| PR | = | Presidential Studies |
| PrEx | = | Presidential Commissions, National Security, Translations, Federal Budget |
| PrVP | = | Vice-Presidential Studies |
| RA | = | Railroad Regulations |
| RR | = | Railroad Retirement Regulations |
| S | = | Diplomacy, Foreign Relations, Treaties, International Development |
| SBA | = | Small Business |
| SE | = | Securities and Company Regulations |
| SI | = | Ethnology, History, Space, Museums, Art, Natural History |
| SSA | = | Social Security |
| T | = | Treasury, Monetary Studies, Customs Regulations, Internal Revenue, Secret Service, Alcohol/Tobacco/Firearms Regulations |
| TD | = | Transportation, Coast Guard, Traffic Safety |
| VA | = | Veterans Services |
| X | = | Congressional Debates |
| Y1 | = | Congressional Reports |
| Y3 | = | Independent Agencies |
| Y4 | = | Congressional Committees |
| Y 7 | = | Memorial Addresses in Congress |
| Y10 | = | Congressional Budget Studies |
| Z | = | Colonial History |