Hoffmann, Helmut.
Die Religionen Tibets : Bon und Lamaismus in ihrer geschichtlichen Entwicklung. (München : Karl Alber, 1956).
https://catalog.hathitrust.org/Record/006757250. [Limited search].
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Hoffmann, Helmut.
The religions of Tibet. Transl. By Edward Fitzgerald. (Westport, Conn. : Greenwood Press, 1979).
https://catalog.hathitrust.org/Record/007035118. [Limited search].
(HoffH6)
History : China : Tibet
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Religion : Lamaism
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Sinology and Asian Studies : Europe : Germany