Thomas Hart Benton [artist], Adams, Henry [Samuel Sosland Curator of American Art, Nelson-Atkins Museum of Art], Box: 106, Folder: 13-14. Sauer's Gouldiana Research about John Gould and other papers, MS 304. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/205566 Accessed July 26, 2024.