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.
For example, given the SuDoc number NAS 1.2:R 11, this is how you would break the SuDoc number down to find this item:
Note that letters always come before numbers and years are always first. Therefore, it goes years, letters, numbers.
NAS 1.2:2004 (where 2004 is a year) would be shelved before NAS 1.2:R 11 and NAS 1.2:613 (a number) would be shelved after NAS 1.2:R 11
On the shelf you would have, NAS 1.2:2004 then NAS 1.2:R 11 and finally NAS 1.2:613
If you have any problems finding Government Documents, ask someone at one of the library service desks for help.