Sources: U. S. National Archives, Mathew Brady Photographs of Civil War -Era Personalities and Scenes, https://www.flickr.com/photos/usnationalarchives/14277523416/in/photostream/

Library of Congress, Detroit Publishing Company Collection, http://www.loc.gov/pictures/item/det1994004795/PP/

Both images photoshopped. Click to enlarge. For information about photographs of Whitman, including other stereographs, see Ed Folsom and Ted Genoways, “‘This Heart’s Geography’s Map’: The Photographs of Walt Whitman,” http://www.vqronline.org/vqr-gallery/1880s-photographs-walt-whitman