Keynes, Quentin on Sykes [Lieutenant-Colonel William Henry Sykes, F.R.S, L.S, G.S, Z.S], offprint, Box: 102, Folder: 5. 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/205476 Accessed November 24, 2024.