The Superintendent of Documents (SuDoc) classification system is used by Federal Depository Libraries to organize U.S. government publications by the agency that issued them, rather than by subject.
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Image courtesy of the U.S. Government Publishing Office (GPO). Source: FDLP SuDoc Classification Chart.
SuDoc numbers may look complex at first, but they follow a logical structure based on the agency and publication type. Each part of the number helps identify where the publication came from and what kind of document it is.
Example:
A 13.150:W 64
A = Department of Agriculture
(The first letter indicates the issuing department)
13 = Forest Service
(The whole number before the dot shows a subordinate agency or office)
.150 = Southern Research Station: General Publications
(The number after the dot represents the publication category or series)
W 64 = Individual publication
(The section after the colon identifies the specific title, issue, or edition—in this case:
“Wildflowers of the Savannah River Site”)
