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Wilderness trails Northwest;a hiker's and climber's overview-guide to national parks and wilderness areas in Wyoming Montana Idaho Northern California Oregon Washington British Columbia Canadian RockiesBook由 Spring, Ira
出版 1974 -
Nature in the Northwestan introduction to the natural history and ecology of the northwestern United States from the Rockies to the PacificBook由 Schwartz, Susan H., 1946-
出版 1983