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Feb. 1923. Photograph of west staircase, seen in photo above; showing extensive collaspse in the thousand years since constructed. Photo also shows a few surviving portions of Temple I at ground level and passages behind grand staircase, which was added on top of Temple I when Temple IV was constructed.       
Scanned from slide taken of original photograph by M. H. Saville; reproduced Courtesy of The Division of Anthropology, American Museum of Natural History.