Não informado. (1948). Collected papers from the Museum of Natural History. Museum of Natural History.
Chicago-referens (17:e uppl.)Não informado. Collected Papers from the Museum of Natural History. Aarhus, Dinamarca: Museum of Natural History, 1948.
MLA-referens (8:e uppl.)Não informado. Collected Papers from the Museum of Natural History. Museum of Natural History, 1948.
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