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How to Read SuDoc Numbers for Federal Documents

How to Read SuDoc Numbers for Federal Documents

Federal Documents use different call numbers than other materials in Dudley Knox Library.

SuDoc (Superintendent of Documents) classification numbers organize documents by the United States government agency that produced them, not by their subject. The letter at the beginning of the call number signals the agency name. Although there are exceptions, A call numbers are publications of the Department of Agriculture, C is Commerce, D is Defense, and so on.

Important: This is not a decimal system. The number after the dot is a whole number.

A SuDoc number that begins..

D 1.1: is followed by…
D 1.3:
D 1.12:
D 1.33:
D 1.122:


Some agencies you will find in Knox Library's Federal Docs collection:

DDefense Department
D 101Army Department
D 108Judge Advocate General's Office (Army)
D 201Navy Department
D 214Marine Corps
D 301Air Force Department
GAGovernment Accountability Office (formerly: General Accounting Office)
HSHomeland Security
NASNational Aeronautics and Space Administration
SState Department
Y4.AR 5/2House Armed Services Committee
Y4.AR 5/3Senate Armed Services Committee
Y4.H75Select Committee on Homeland Security (House)

We always welcome your questions! Please see Library Staff for help.

Revised: 08/11/2004

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All information contained herein has been approved for release by the NPS Public Affairs Officer.
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