Roper Social and Political Trends Data (1973-1994) Brady HE, Putnam RD, Campbell AL, Elms LE, Yonish S, Apollonio DE. Roper Social and Political Trends Data (1973-1994). 2000. 2000 https://researcherprofiles.org/profile/46405654 Brady HE, Putnam RD, Campbell AL, Elms LE, Yonish S, Apollonio DE
