The Hall of the Age of Man. (Guide leaflet 52)
[New York] : American Museum of Natural History
1921 edition "Reprinted with slight changes from Natural history, the journal of the American museum of natural history, for May-June, 1920, pages 228-246". Third edition, c1925 was revised and enlarged and edited by William K. Gregory.
American Museum of Natural History. Hall of the Age of Man., Human evolution -- Exhibitions., Prehistoric peoples -- Exhibitions.