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1Published 1989“...U.S. Dept. of the Interior/National Park Service,...”
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2by Schoch-Roberts, Lisa“...U.S. Dept. of the Interior, National Park Service, Intermountain Region,...”
Published 1997
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3by Benck, Kevin M.“...U.S. Department of the Interior, National Park Service, Natural Resource Stewardship and Science,...”
Published 2016
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Government Document eBook