Books by Marion H. Duncan:
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Duncan, Marion H. (Marion Herbert), 1896-1977: The Mountain of Silver Snow (Cincinnati: Powell and White, c1929) (page images at HathiTrust)
Additional books by Marion H. Duncan in the extended shelves:
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Duncan, Marion H. (Marion Herbert), 1896-1977: The Yangtze and the yak : adventurous trails in and out of Tibet. ([publisher not identified], 1952) (page images at HathiTrust)
Find more by Marion H. Duncan at your library, or elsewhere.