Geological Survey (U.S.)Verticle; By USGS High Altitude (VV OA M 28 137-3359,3360); Scale 1:54,400JPEGoai:digital.library.illinois.edu:ee1b8480-8a10-0137-6d99-02d0d7bfd6e4-2528engPublicStereogram No. 528 - Grand CanyonImageryArizona--Grand Canyon National ParkArizona1955-10-11University of Illinois Urbana-Champaign