※一部利用できない機能があります
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University of Michigan. School of Natural Resources ; Bureau of Outdoor Recreation U.S. Dept of the Interior
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| 2.
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College of national resources Utah State University ; Bureau of Outdoor recreation, U.S. department of the Interior
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| 3.
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State University College of Forestry at Syracuse University ; Bureau of Outdoor recreation, U.S. department of the Interior, and Syracuse University
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