The Inter-university Consortium for Political and Social Research is an organization of member institutions working together to:
From the User Guide at http://www.icpsr.umich.edu/ICPSR/help/newuser.html :
Are you interested in determining the average age at which men versus women begin smoking? What if you need to know whether age at marriage differs between your region of the country and other regions, or about differences in political attitudes based on age, gender, education, race, or ethnicity? These and countless other questions can be answered by studies in the ICPSR data holdings.
Please note that ICPSR does not provide publications, reports, or ready-made statistics. What we do supply are the numeric raw data used to create publications, reports, and figures. To view findings that others have published, select the "related literature" link for a given data set on the search results page or at the top of each study description. This will take you to a bibliography of publications based on that data, with links to online reports, when available.