The Superintendent of Documents (SuDocs) classification system uses
letters and numbers to organize publications produced by the U.S.
government and its agencies. Documents are organized by originating
agency, type of document and, occasionally, year of publication.
Here is an explanation of a sample SuDocs classification number. The
document is a yearbook from the Department of Agriculture published in
A 1.10 indicates agency/type of document
: Separates agency/publication information
985 indicates 1985 publishing date
The following is a list of the more commonly used agency stems:
AE 2 -- Federal Register Office (National Archives and Records Administration) C 3 -- Census Bureau (Commerce Department) D -- Defense Department E -- Energy Department ED 1 -- Education Department EP 1 -- Environmental Protection Agency GA -- General Accounting Office HE -- Health and Human Services Department I 19 -- U.S. Geological Survey (Interior Department) J -- Justice Department L -- Labor Department NAS -- National Aeronautics and Space Administration (NASA) PrEx -- Executive Office of the President S -- State Department SBA -- Small Business Administration T 22 -- Internal Revenue Service (Treasury Department) VA -- Department of Veterans' Affairs X, Y -- Congress