Indexes for Specific Census Years:

Bureau of the Census Catalog of Publications, 1790-1972, Docs Index C 3.163/3: 

• detailed information about what information was collected in the censuses during this time
• print volumes are found in the Docs Special Census Section: C 3.X

Population Information in Nineteenth Century Census Volumes, 2 vols., Docs Index HA 214.S44 1983

Population Information in Twentieth Century Census Volumes: 1900-1980. 2 vols., Docs Index HA 214.S44 198

Subject Index to the 1990 Census of Population and Housing., Docs Index HA 201 1990.F3 1997

• paper volumes (Docs C 3.X 1: 990) and the Summary Tape Files in electronic format (CD-ROM and on-line)