This primary source comes from the Records of the National Park Service.
National Archives Identifier:
519942Full Citation: Cliff Palace, Mesa Verde National Park,' Colorado. (vertical orientation); 1933 - 1942; Records of the National Park Service, Record Group 79. [Online Version, https://docsteach.org/documents/document/cliff-palace-mesa-verde-national-park-colorado-vertical-orientation, December 6, 2024]