{"id":"000222897","type":"book","title":"History and stratigraphy in the valley of Mexico","publisher":"Smithsonian Institution","publisher-place":"Washington, D.C","container-title":"Smithsonian Annual Report, (1938), p. 521-530 (with 13 plates","author":[{"family":"Vaillant","given":"George Clapp 1901-1945"}],"issued":{"raw":"1939"}}