[Knowsley Hall] Letters-Published ["Letters from Knowsley Hall, Lancashire" by W. Wagstaffe and G. Rutherford]. Lord Derby, North West Naturalist, Box: 13, Folder: 32. 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/205768 Accessed September 07, 2024.