The SuDoc classification system is designed to group together publications by the government author. Each government department is assigned its own alphabetical identifier, based on the name of the organization, e.g., C is used for Commerce, and NAS is used for NASA. To distinguish the subordinate bureaus and the offices, numbers are added to the alphabetic identifiers with “1” designating the secretary's or administrative's office. Beginning with “2,” the numbers are applied in numerical order to each subordinate office. A period follows the combination of letters and numbers representing the bureau or office.
Adding a number after the period the SuDoc classification system allows for the identification of the various series of publications issued by a particular bureau or office. For example:
The SuDoc number is written on the upper left hand corner of the document. The number may also be found on the inside front cover, especially on hard cover books. Locating a document is a matter of following the SuDoc number through the stacks to the correct spot:
For example, given the SuDoc number NAS 1.2:R 11:
Note that numbers always come before letters. For example: NAS 1.2:613 would be shelved before NAS 1.2:R 11, because numbers get shelved first.
For assistance with obtaining a government document, or with government research in general, please contact the. You can also contact one of the service desks on the first and second floors of the library for assistance.