The U.S. Superintendent of Documents developed this system (also called SuDocs) for the arrangement of federal government publications. Arrangement is generally by issuing agency; for more information see our U.S. SuDoc & Agency List page. Some of the Government Documents collections use this classification system.
SuDocs numbers consist of a letter, designating the particular issuing agency, followed by numbers identifying subordinate bureaus within the agencies and specific publications. Below is a list of prefixes and their corresponding agencies: