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Creator
- Finley, William L. (William Lovell), 1876-1953 20
- Church, Campbell 10
- O'Malley, Henry 4
- Darling, Jay N. (Jay Norwood), 1876-1962 3
- Ickes, Harold L. (Harold LeClair), 1874-1952 3
- Mead, Elwood, 1858-1936 3
- Finley, Irene 2
- Henderson, W. C. 2
- Parsons, Philip A. (Philip Archibald), 1879-1943 2
- Stanbery, V. B. (Van Buren), 1889- 2
- United States. Bureau of Biological Survey 2
- United States. Department of Agriculture 2
- Van Winkle, I. H. (I. Homer) 2
- Worcester, H. M. 2
- Ziesenhenne, Fred C. 2
- Advisory Committee on Rural Land Zoning 1
- Ahlstrom, Elbert H. 1
- American Nature Association 1
- Amory, Copley 1
- Andrews, Stanley P. 1