This primary source comes from the Records of the National Park Service.
National Archives Identifier:
519885Full Citation: View with shadowed ravine, 'Grand Canyon from South Rim, 1941,' Arizona. (Vertical Orientation); 1941; Records of the National Park Service, Record Group 79. [Online Version, https://docsteach.org/documents/document/view-with-shadowed-ravine-grand-canyon-from-south-rim-1941-arizona-vertical-orientation, September 9, 2024]