Books by Robert J. Landry:
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Landry, Robert J. (Robert John), 1913-: Who, What, Why is Radio? (first edition; New York: G. W. Stewart, c1942) (page images at HathiTrust)- Landry, Robert J. (Robert John), 1913-: Who, What, Why is Radio? (revised edition; New York: G. W. Stewart, ca. 1946) (PDF at worldradiohistory.com)
Additional books by Robert J. Landry in the extended shelves:
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Landry, Robert J. (Robert John), 1913-: Magazines and radio criticism (National association of broadcasters, 1942) (page images at HathiTrust)
Find more by Robert J. Landry at your library, or elsewhere.