ICPSR This link opens in a new windowArchive of social science data, based at the University of Michigan. All data come from international and national surveys carried out by a variety of institutions in the world and encompass a range of academic disciplines, including political science, sociology, demography, history, economics, international relations, gerontology, public health, criminal justice, and education. Data include questionnaires, codebooks, methodology and related literature, and are supplied as files for use with statistical software (SAS, SPSS, ...).