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- United States. Forest Service22
- Hawley, Ralph C. (Ralph Chipman), 1880-197112
- Toumey, James W. (James William), 1865-19329
- Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)8
- League of Nations6
- United States. Department of Agriculture6
- United States. Natural Resources Conservation Service6
- Conan, Michel5
- Food and Agriculture Organization of the United Nations5
- Lutz, H. J. (Harold John), 1900-5
- New York (State). Dept. of Agriculture5
- Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.)5
- United States5
- United States. Agricultural Research Service5
- Bryant, Ralph Clement, b. 18774
- Record, Samuel J. (Samuel James), 1881-19454
- United States. National Park Service4
- United States. Soil Conservation Service4
- Bell, Simon, 1957 May 24-3
- Chapman, Herman Haupt, 1874-19633