Penniman, Howard Rae, 1916-, Mujal-León, Eusebio, 1950-, American Enterprise Institute
Duke University Press
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Noelle-Neumann, Elisabeth, 1916-, Neumann, Erich Peter, Institut für Demoskopie
Greenwood Press
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Penniman, Howard Rae, 1916-, Farrell, Brian, American Enterprise Institute for Public Policy Research
Duke University Press
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American Enterprise Institute for Public Policy Research, Ranney, Austin, 1920-
Duke University Press
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Butler, David, 1924-, Penniman, Howard Rae, 1916-, Ranney, Austin, 1920-
American Enterprise Institute for Public Policy Research
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Lee, Mary., Najera Chesler, Aisha., SpringerLink (Online service)
Springer International Publishing : Imprint: Springer
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Sait, Edward McChesney, 1881-1943, Penniman, Howard Rae, 1916-
Appleton-Century-Crofts
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David Hume Institute
Edinburgh University Press
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Gallup, George Horace, 1901-, Rae, Saul Forbes
Simon and Schuster
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Scott, Claudia Devita, Victoria University of Wellington. Institute of Policy Studies
Institute of Policy Studies
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Noelle-Neumann, Elisabeth, 1916-, Institut für Demoskopie
Greenwood Press
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Ranney, Austin
Duke University Press
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