The first letters of a Superintendent of Documents (SuDoc) number reflect the department or agency that issues the publication. The issuing agency is the document author. Additional information on subordinate SuDoc structure is available at FDLP.
As of November 2010, the current lettering used for SuDoc class stems are:
| A | Agriculture |
| AE | National Archives and Records Administration |
| B | Broadcasting Board of Governors |
| C | Commerce Department |
| CC | Federal Communications Commission |
| CR | Civil Rights Commission |
| D | Defense Department |
| E | Energy Department |
| ED | Education Department |
| EP | Environmental protection Agency |
| FA | Fine Arts Commission |
| FCA | Farm Credit Administration |
| FHF | Federal Housing Financing Board |
| FM | Federal Mediation and Conciliation Service |
| FMC | Federal Maritime Commission |
| FR | Federal Reserve System Board of Governors |
| FT | Federal Trade Commission |
| FTZ | Foreign-Trade Zones Board |
| GA | Government Accountability Office |
| GP | Government Printing Office |
| GS | General Services Administration |
| HE | Health and Human Services Department |
| HH | Housing and Urban Development Department |
| HS | Homeland Security |
| I | Interior Department |
| IC | Interstate Commerce Commission |
| ID | US Agency for International Development |
| ITC | International Trade Commission |
| J | Justice Department |
| JU | Judiciary |
| L | Labor Department |
| LC | Library of Congress |
| LR | National Labor Relations Board |
| MS | Merit Systems Protection Board |
| NAS | National Aeronautics and Space Administration |
| NC | National Capital Planning Commission |
| NCU | National Credit Union Administration |
| NF | National Foundation on the Arts and the Humanities |
| NMB | National Mediation Board |
| NS | National Science Foundation |
| OP | Overseas Private Investment Corporation |
| P | United States Postal Service |
| PE | Peace Corps |
| PM | Personnel Management Office |
| PR | President of the United States |
| PREX | Executive Office of the President |
| PRVP | Vice President of the United States |
| RR | Railroad Retirement Board |
| S | State Department |
| SBA | Small Business Administration |
| SE | Securities and Exchange Commission |
| SI | Smithsonian Institution |
| SSA | Social Security Administration |
| T | Treasury Department |
| TD | Transportation Department |
| TDA | US Trade and Development Agency |
| VA | Veterans Affairs Department |
| X & Y |
Congress |
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