Primary Information Source(s):

PUMS Files:  United States Department of Commerce, Bureau of
	     the Census.  Census of Population and Housing,
	     1970 United States: Public Use Microdata Samples
	     [Computer file].  Washington, DC: U.S. Department
	     of Commerce, Bureau of the Census [producer],
	     1971.  Ann Arbor, Michigan:  Inter-university
	     Consortium for Political and Social Research
	     [distributor], 197x.

Codebooks:   Printed or machine-readable technical
	     documentation document these data.  The title of
	     the printed documentation is Public Use Samples of
	     Basic Records From the 1970 Census.  The title of
	     the machine-readable documentation is Census of
	     Population and Housing, 1970 [United States]:
	     Public Use Samples.  Both documents contain the
	     same information, they have different titles
	     because one was published by the United States
	     Bureau of the Census and the other by ICPSR.  Both
	     documents contain supplements 1 - 3.

Electronic Data Dictionary: The data dictionary and variable
	     listing were generously provided by Ann Gray, Cornell
	     University.