SuDoc Classification System

Federal Government publications in the Government Documents Collection are arranged by the Superintendent of Documents classification number (SuDoc). Print publications are grouped together by the issuing agency. Micro format, CD-ROM, and on-line publications may use other classification methods. To ensure that you find all of the materials available on a particular subject, be sure to check the indexes recommended by Mac Reed, Assistant Director of Technical Services and Government Documents Librarian.
The example below shows how the Superintendent of Documents classification number

C 61.34:987
is constructed for the publication of U.S. Industrial Outlook.

C refers to the Commerce Department (which is the issuing agency)

61. refers to the International Trade Administration (the subordinate bureau within the issuing
agency).

34: is the number designating the specific title of this document.

987 refers to the year of publication (1987).

Here are the prefixes from the Superintendent of Documents classification numbers for some other agencies in which you may be interested:

A Agriculture Department.

C Commerce Department.

C 3. Census Bureau (Commerce Department).

D Defense Department.

E Energy Department.

ED Education Department.

GA General Accounting Office.

GS General Services Administration.

HE Health and Human Services Department.

I Interior Department.

I 19. U.S. Geological Survey (Interior Department).

J Justice Department.

Ju Judiciary.

L Labor Department.

LC Library of Congress.

NAS National Aeronautics and Space Administration.

S State Department.

SI Smithsonian Institution.

T 22. Internal Revenue Service (Treasury Department).

X, Y Congress.

Y 4. Congressional Committees.

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