Reviews : The Organic Machine: The Remaking of the Columbia River Richard White New York,Hill and Wang,1995. 130 pages. $7.95 Our Natural History: The Lessons of Lewis and Clark Daniel B. Botkin New York,G.P. Putnam's Sons,1995. 300 pages. $14.00

William S. Alverson, Walter Kuhlmann and Donald M. Waller. 1994. Wild Forests: Conservation Biology and Public Policy, Island Press, Washington, D.C.