principle investigator: James A. Davis ; director & co-principal investigator: Tom W. Smith
National Opinion Research Center, University of Cicago [producer] , The Roper Center for Public Opinion Research Center, University of Conneticut [distributor]
1994-
NORC ed
National data program for the social science series
no. 14-15
1972-1980 , 1972-1994 , 1972-1996
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