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The SRC 1968 American national election study : frequencies addendum ; pre-election wave : Sept.-Oct. 1968 ; post-election wave : Nov. - Dec. 1968
- "Survey Research Center 1968 election study"@en
- "Survey Research Center 1968 American national election study"@en
- "American national election study, 1968"@en
- "The SRC 1968 American national election study : frequencies addendum ; pre-election wave : Sept.-Oct. 1968 ; post-election wave : Nov. - Dec. 1968"@en
- "SRC 1968 American national election study : frequencies addendum"@en