Bernard Noel Langdon-Davies (1876–1952) was a British pacifist activist. (From Wikipedia)
More about B. Langdon-Davies:Books by B. Langdon-Davies:
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Langdon-Davies, B. (Bernard), 1876-1952: Unto What End? (New York: American Association for International Conciliation, 1914) (page images here at Penn)
Additional books by B. Langdon-Davies in the extended shelves:
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Langdon-Davies, B. (Bernard), 1876-1952: Democracy and the press (The National Labour Press, Ltd., 1920), also by F. H. Hayward (page images at HathiTrust)- Langdon-Davies, B. (Bernard), 1876-1952: Unto what end? (American Association for International Conciliation, 1913) (page images at HathiTrust)
Find more by B. Langdon-Davies at your library, or elsewhere.