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University at Buffalo Libraries

Understanding Government Document Call Numbers

Library call numbers which begin with the prefix "US" indicate a United States federal government document. These documents use a different call number system than the regular book collections at the UB Libraries. The Superintendent of Documents ("SuDocs") Classification System groups federal documents by the government department or agency that produced them. Each department and agency is assigned a unique letter code. The table below contains examples of selected departments and agencies whose documents may be found in the UB Libraries.



Department / Agency


Agriculture Department


National Archives and Records Administration


Commerce Department

  C 3

Census Bureau


Defense Department


Energy Department


Education Department


Environmental Protection Agency


Federal Reserve Board


Federal Trade Commission


General Accounting Office


General Services Administration


Health and Human Services


Homeland Security


Interior Department

  I 19

U.S. Geological Survey


Justice Department




Labor Department


Library of Congress


National Aeronautic and Space Administration


President of the United States


Executive Office of the President


State Department


Small Business Administration


Securities and Exchange Commission


Treasury Department

  T 22

Internal Revenue Service


Transportation Department


Veterans' Affairs





  Y 4

Congressional Committees/Hearings

The remaining letters and numbers in a SuDocs call number contain additional information which will be necessary to locate the document on the library shelf, including the subordinate office and type of publication. It is important to note the entire SuDocs call number before attempting to locate a federal government document on the shelf in the UB Libraries.

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Last Update: October 2009