Primary Information Source(s):

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

Electronic Data Dictionary: The data dictionary and variable 
	     listing were generously provided by the Center for 
	     Demography and Ecology, University of Wisconsin, 
	     Madison WI.