Cowhand Bob Souza administers antibiotics at Big Creek Ranch, a vast cattle ranch in Carbon County, Wyoming, close to the Colorado border

Title, date and keywords based on information provided by the photographer.
Credit line: Gates Frontiers Fund Wyoming Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photographs Division.
Gift; Gates Frontiers Fund; 2015; (DLC/PP-2015:069).
Forms part of: Gates Frontiers Fund Wyoming Collection within the Carol M. Highsmith Archive.