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1993
United States
The economic value of wilderness : proceedings of the conference, Jackson, Wyoming, May 8-11, 1991
1992
Payne, Claire |
Bowker, J. M. |
Reed, Patrick C. |
Wildlife refuges
1943
Gabrielson, Ira Noel |
The fifth essence : an invitation to share in our eternal heritage
Tilden, Freeman |
The national forests of America
1968
Freeman, Orville L. |
Frome, Michael |
Classification of wetlands and deepwater habitats of the United States
1992
Cowardin, Lewis M. |
Carter, Virginia |
Golet, Francis C. |
LaRoe, Edward T. |