Andrews, Roy Chapman, 1884-1960.American Museum of Natural History.Asiatic Zoölogical Expedition of the American Museum of Natural History (2nd : 1918-1919)Central Asiatic Expeditions (1921-1930)2018-06-072018-06-071919http://digitallibrary.amnh.org/handle/2246/688311 v. ; 27 cm.[1-2]. Mongolian trip, 1918-1919 (2 v.)Scientific expeditions -- Gobi Desert (Mongolia and China)Scientific expeditions -- Mongolia.Gobi Desert (Mongolia and China) -- Discovery and exploration.Mongolia -- Discovery and exploration.Asia, Central -- Discovery and exploration.Paleontology -- Gobi Desert (Mongolia and China)Paleontology -- Mongolia.Andrews, Roy Chapman, 1884-1960.Asiatic Zoölogical Expedition of the American Museum of Natural History (2nd : 1918-1919)Central Asiatic Expeditions (1921-1930)Book