Map of Yellowstone National Park for purposes of the wildfowl census conducted by the U.S. Biological Survey : showing the chief areas of water and other wildfowl haunts, also the districts covered by the respective census takers / map drawn by E.J. Sawyer, park naturalist, [between 1924 and 1926?].
Related Entities
There are 2 Entities related to this resource.
Sawyer, Edmund J. (Edmund Joseph), 1880-1971
http://n2t.net/ark:/99166/w68921n3 (person)
United States. Bureau of Biological Survey
http://n2t.net/ark:/99166/w60g7v5w (corporateBody)