1859-60; 1862 photography; showing collapsed sections and 2 crucial intact sections; also showing that mask stacks do not project above roofline.
Photograph mounted in Vol.1 of  Désiré Charnay, Cités et Ruines Américaines, 1862; taken by Charnay 1859-60. This image scanned from a 35mm slide taken from a copy in the AMNH (RF-106-D). Reproduced Courtesy of The Library, Special Collections, American Museum of Natural History.