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  1. By: Knowlton, Frank Hall, - United States. National Park Service
    Publication info: Washington :G.P.O.,1921.
    Holding Institution: Harold B. Lee Library (archive.org)
  2. By: Knowlton, Frank Hall, - United States. National Park Service
    Publication info: Washington,Govt. print. off.,1921.
    Holding Institution: Smithsonian Libraries
  3. By: United States. National Park Service - Bailey, Florence Merriam, - Bailey, Vernon,
    Publication info: Washington,Govt. print. off.,1918.
    Holding Institution: Smithsonian Libraries
    BHL Collections: Early Women in Science | Women in Natural History