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. Industrial Outlook has the SuDoc number:

C	61.	34:	994
Commerce Department (issuing agency)	International Trade Administration (subordinate bureau within the agency)	Number designating the title	Year of publication (1994)

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.