Jean Yoder and William Proctor

Facts on File c1988

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George Gallup, Jr., Alec M. Gallup with William Proctor

Dow Jones-Irwin c1986

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George Gallup, Jr. with William Proctor

W. Morrow 1984 1st ed

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J. William Worden and William Proctor

Prentice-Hall c1976

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