Understanding Call Numbers

Superintendent of Documents Classification

- United States Government Publications -

AAgriculture Department
C.3Census Bureau (Commerce Department)
DDefence Department
EEnergy Department
EDEducation Department
GAGeneral Accounting Office
GSGeneral Services Administration
HEHealth and Human Services
IInterior Department
JJustice Department
JuJudiciary Department
LLabor Department
LCLibrary of Congress
NASNational Aeronautics and Spcace Administration
SState Department
S1Smithsonian institute
T22Internal Revenue Service (Treasury Department)
X, YCongress
Y4Congressional Committees