Books by William P. Gregg:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Gregg, William P.: Fourth World Wilderness Congress : worldwide conservation : proceedings of the symposium on biosphere reserves : September 11-18, 1987 (U. S. Department of the Interior, National Park Service, Science Publications Office, 1987), also by Colo. and Estes Park World Wilderness Congress (4th : 1987 : Denver, James D. Wood, Stanley L. Krugman, World Wilderness Leadership Foundation, and Colo.) Symposium on Biosphere Reserves (1987 : Estes Park (page images at HathiTrust)- Gregg, William P.: Worldwide conservation : proceedings of the symposium on biosphere reserves (U.S. Dept. of the Interior, National Park Service, Science Publications Office ;, 1989), also by Colo.) Symposium on Biosphere Reserves (1987 : Estes Park, James D. Wood, Stanley L. Krugman, United States. National Park Service. Science Publications Office, Unesco. MAB Secretariat, and World Wilderness Leadership Foundation (page images at HathiTrust)
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