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Guide to Interpreting SuDoc Classification Numbers

Tips for locating US Government Publications shelved using the Superintendent of Documents Classification System

Federal Depository Library Program

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In many libraries, including Ottenheimer Library here at UALR, federal depository publications are shelved using the Superintendent of Documents Classification.  Depending on the format of the document, it might be shelved in one of several locations, indicated in the online catalog. The paper volumes can be located in the stacks on the third floor.  Microfiche, CD-ROMs, DVDs and video casettees are located on the third floor.  For assistance in locating materials, please ask at the main desk. Several other materials can be accessed in fulltext through assorted filed linked from the Articles and Databases pages.

Standard Information for all SuDoc Numbers

In the Superintendent of Documents (SuDocs) classification system, the call number is divided into two parts: the class number, or stem, and the individual book number.


A colon separates the class number from the book number. If the colon is followed by a letter, the publication is a monograph. If the colon is followed by a number, it is a serial.



              Civil War Manuscripts   LC 4.2: C 49

              LC          Library of Congress

 4             Manuscript Division                 

   .2          type of publication (General Publications)

   : C 49     individual book number



   Monthly Labor Review   L 2.6: 26/9

    L              Department of Labor

    2              Labor Statistics Bureau

    .6             type of publication (journal)

    :26           volume 26

   / 9             issue 9