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| | Historical, Demographic, Economic, and Social Data: The United States, 1790-1970 (Site not responding. Last check: 2007-10-13) |
 | | Detailed county and state-level ecological or descriptive data for the United States for the years 1790 to 1970 are contained in this collection. |
 | | These data files contain extensive information about the social and political character of the United States, including a breakdown of population by state, race, nationality, number of families, size of the family, births, deaths, marriages, occupation, religion, and general economic conditions. |
 | | The Population of the United States from 1790-1970 |
| webapp.icpsr.umich.edu /cocoon/ICPSR-STUDY/00003.xml (401 words) |
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