Books by Royden J. Dangerfield:
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Dangerfield, Royden J. (Royden James), 1902-1969: The New Japan (Headline Series #102; New York: Foreign Policy Association, 1953) (multiple formats at archive.org)
Additional books by Royden J. Dangerfield in the extended shelves:
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Dangerfield, Royden J. (Royden James), 1902-1969: In defense of the Senate; a study in treaty making (University of Oklahoma press, 1933) (page images at HathiTrust)
Find more by Royden J. Dangerfield at your library, or elsewhere.