. . . . "On the trail of ancient man : a narrative of the field work of the central Asiatic expeditions"@en . "On the trail of ancient man a narrative of the field work of the Central Asiatic Expeditions"@en . . "On the trail of ancient man a narrative of the field work of the Central Asiatic Expeditions" . . . . . . "On the trail of ancient man : A narrative of the field work of the Central Asiatic expeditions" . . . . . . "On the trail of ancient man"@en . "On the trail of ancient man" . . . . . . "On the trail of ancient man : a narrative of the field work ot the Central Asiatic expeditions" . . . . . . "On the trail of ancient man a narrative of the field work of the Central Asiatic expeditions"@en . "On the trail of ancient man : a narrative of the field work of the Central Asiatic Expeditions"@en . "On the trail of ancient man : a narrative of the field work of the Central Asiatic Expeditions" . . . . . . . . . . . . . . . . . "On the trail of ancient man; a narrative of the field work of the Central Asiatic expeditions"@en . "On the trail of ancient man; a narrative of the field work of the Central Asiatic expeditions" . "On the Trail of Ancient Man : a Narrative of the Field Work of the Central Asiatic Expeditions. By Roy Chapman Andrews. With an Introduction and a Chapter by Henry Fairfield Osborn. With 58 Photographs by J.B. Shackelford" . . . "On the trail of ancient man : a narrative of the work of the Central Asiatic expeditions"@en . "On the trail of ancient man : a narrative of the fieldwork of the Central Asiatic expeditions" . . . . . "On the trail of ancient man. : a narrative of the field work of the Central Asiatic expeditions" . . . "On the Trail of Ancient Man. A narrative of the field work of the Central Asiatic Expeditions ... With an introduction and a chapter by Henry Fairfield Osborn ... With 58 photographs, etc"@en . . "On the Trail of ancient man" . . . . . . "On the trail of ancient man : a narrative of field work of the Central Asiatic expeditions/c by Roy Chapman Andrews, with an introduction and a chapter by Henry Fairfield Osborn ; with 58 photographs by J.R. Shackelford"@en . . . "On the trail of ancient man : a narrative of the field work of the Central Asiatic expeditions"@en . "Expéditions scientifiques Gobi, Désert de." . . "Forskningsresor." . . . . "Man, Origin." . . "Central Asiatic Expeditions (1921-1930)" . . . "Gobi Desert (Mongolia and China)" . . "Central Asiatic Expeditions of the American Museum of Natural History." . . "Wyprawy archeologiczne Mongolia 1900-1945." . . "Centralasien." . . "Central Asiatic Expeditions of the American Museum of Natural History (1921-1930)" . . . "Paleontology Mongolia." . . "Gobi (Mongolia and China)" . . "Asia, Central" . . "Mongolia" . . "Central Asiatic expeditions of the American museum of natural history." . . "Expeditions Mongolia." . .