Elwood Mead in 1928. By Underwood & Underwood – This image is available from the United States Library of Congress's Prints and Photographs divisionunder the digital ID cph.3b30798.This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing for more information., Public Domain, https://commons.wikimedia.org/w/index.php?curid=15933145
John Wesley Powell. By Painter: Edmund Clarence Messer (1842 – 1919) – Flickr, Public Domain, https://commons.wikimedia.org/w/index.php?curid=7299882