Údar
- United States. Forest Service 15 toradh
- Dumbarton Oaks Colloquium on the History of Landscape Architecture 4 toradh
- Pyne, Stephen J., 1949- 4 toradh
- Resources for the Future 4 toradh
- University of Maine at Orono. Cooperative Forestry Research Unit 4 toradh
- National Research Council (U.S.). Transportation Research Board 3 toradh
- Shands, William E. 3 toradh
- United States. Forest Service. Northern Research Station 3 toradh
- American Fisheries Society 2 toradh
- American Forestry Association 2 toradh
- American Pulpwood Association 2 toradh
- Brown, Nelson Courtlandt, 1885- 2 toradh
- Center for American Places (Harrisonburg, Va.) 2 toradh
- Clawson, Marion, 1905- 2 toradh
- Conservation Foundation 2 toradh
- Duerr, William A. (William Allen), 1911- 2 toradh
- Forest Products Laboratory (U.S.) 2 toradh
- Guise, Cedric Hay, 1890- 2 toradh
- Harker, Donald F. 2 toradh
- Hays, Samuel P. 2 toradh
- Hyde, William F. 2 toradh
- Intermountain Forest and Range Experiment Station (Ogden, Utah) 2 toradh
- Korstian, Clarence Ferdinand, 1889-1968 2 toradh
- Kusel, Jonathan 2 toradh
- New York Audubon Society 2 toradh
- Nyland, Ralph D. 2 toradh
- Olmsted, Frederick Law, 1822-1903 2 toradh
- Sample, V. Alaric 2 toradh
- Sharpe, Grant W. (Grant William) 2 toradh
- Society of American Foresters 2 toradh
- Society of American Foresters. Remote Sensing Working Group 2 toradh
- Toumey, James William, 1865-1932 2 toradh
- United States Golf Association 2 toradh
- United States. Fish and Wildlife Service 2 toradh
- United States. Forest Service. North Central Research Station 2 toradh
- Adams, Darius Mainard, 1944- 1 toradh
- Adams, William Howard 1 toradh
- Adler, Elisa 1 toradh
- Albright, Horace M. (Horace Marden), 1890-1987 1 toradh
- Allen, Shirley Walter, 1883- 1 toradh
- Alverson, William Surprison 1 toradh
- American Association of Law Libraries 1 toradh
- American Law Institute 1 toradh
- Anderson, Laura E. 1 toradh
- Anderson, S. (Steven), 1956- 1 toradh
- Anderson, Virginia DeJohn 1 toradh
- Andrews, Patricia L. 1 toradh
- Archer, Sellers Gambrell, 1908- 1 toradh
- Arluke, Arnold 1 toradh
- Audubon, John James, 1785-1851 1 toradh níos mó…