This primary source comes from the Records of the U.S. Geological Survey.
National Archives Identifier:
517970Full Citation: Colorado River. Near upper end of the canyon. Boats of the Powell Expedition of 1872 pictured. Beaman photo. ('Romance of the Colorado River', page 267 calls this 'A Halt for Observations', possibly S; 1871 - 1878; Records of the U.S. Geological Survey, Record Group 57. [Online Version, https://www.docsteach.org/documents/document/colorado-river-near-upper-end-of-the-canyon-boats-of-the-powell-expedition-of-1872-pictured-beaman-photo-romance-of-the-colorado-river-page-267-calls-this-a-halt-for-observations-possibly-steward-in-t, May 1, 2024]