Census History
History of the Census, Census.gov
Census Documents
U.S. Census Bureau Catalog and Guide, 1946 - 1998
Census Non-population Data, National Archives
Research Tips, 1790 - 1920 Censuses, Ancestry.com
Census Schedules Article, Ancestry.com
Special Schedules Article, Ancestry.com
Finding Data
American FactFinder
IPUMS Microdata
Ancestry.com
Genealogy.com
First in the Path of Firemen: The Fate of the 1890 Population Census
Decennial Census of Population and Housing, 1790 - 2000