PUMS Files: Census of Population of Housing, 1990: Public Use Microdata Sample [machine-readable data files]/prepared by the Bureau of the Census - Washington: The Bureau [producer and distributor], 1992. Codebooks: U.S. Dept. of Commerce, Bureau of the Census. CENSUS OF POPULATION AND HOUSING, 1990 [UNITED STATES]: PUBLIC USE MICRODATA SAMPLE: 1-PERCENT SAMPLE [Computer file]. 2nd release. Washington, DC: U.S. Dept. of Commerce, Bureau of the Census [producer], 1993. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 1993.