A "government publication" is defined in the U.S. Code as "informational matter which is published as an individual document at Government expense, or as required by law" (44 U.S.C. 1901).
SAC Library is a partial depository library and collects Federal Documents in print and electronic format that pertain to the geographic region.
As of June 2008, there were 1,252 depository libraries in the United States and its territories.