(Willow) Ptarmigan tracks on a snowy slope among dwarf birches, November 12, 1947

(Willow) Ptarmigan tracks on a snowy slope among dwarf birches, November 12, 1947, Container: Series VII: Box 19E, Folder: 143. Francis Harper papers, MS 245. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/529540 Accessed December 26, 2025.