Superintendent of Documents Classification

A – Agriculture Dept.
AE – National Archives
C – Commerce Dept.
C 3. Census Bureau
D – Defense Dept.
E – Energy Dept.
ED – Education Dept.
GA – General Accounting Office
GS – General Services Admin.
HE – Health & Human Services Dept.
HH – Housing & Urban Development Dept.
I – Interior Dept.
I 19. US Geological Survey
J – Justice Dept.
JU – Judiciary
L – Labor Dept.
LC – Library of Congress
NAS- NASA
S – State Dept.
SI – Smithsonian Institution
T – Treasury Dept.
T 22. IRS
TD – Transportation Dept.
VA – Veterans Affairs Dept.
X,Y – Congress
Y 1. Congressional Reports
Y 4. Congressional Hearings
Depository items at Ladd are arranged by their Superintendent of Documents classification numbers. Publications are grouped together by issuing agency. For example the U.S. global trade outlook has the SuDoc number:

C 61. 34/3: 995-2000
Commerce
Department
(issuing agency)		 International Trade
Administration
(subordinate
bureau
within the agency)		 Number
designating
the
title		 Year

Note: that the ‘dot’ in a SuDoc number is a period, not a decimal. For example, “C 61.34:” is shelved after “C 61.7:”

Congressional Hearing: GOVT. Y 4.AG 8/1: F 28
Y 4. Indicates Congress; AG 8/1: – name of committee; F 28 – individual title

S.HRG. and S.PRT. are filed at the end of a committee’s hearings, not under S.