PUMS Files: U.S. Department of Commerce, Bureau of the Census. Census of Population, 1940 [United States]: Public Use Microdata Sample [computer file]. Washington, DC: United States Department of Commerce, Bureau of the Census [producer], 1983. Ann Arbor, Michigan: Inter-university Consortium for Political and Social Research [distributor], 1984. Codebook: A printed codebook, Census of Population, 1940: Public-Use Microdata Samples, documents the 1940 data. The codebook includes an abstract, descriptions of sample design, processing procedures and file structure, a data dictionary (record layout), category code lists, and a glossary. Electronic Data Dictionary: The data dictionary and variable listing were generously provided by the Center for Demography and Ecology, University of Wisconsin, Madison WI.