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2Published 1987“...National Park Service, U.S. Dept. of the Interior,...”
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3Published 2014“...National Park Service, U.S. Department of the Interior,...”
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4Published 2006“...U.S. Deptartment of the Interior National Park Service,...”
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5Published 2011“...U.S. Department of the Interior, National Park Service, Denver Service Center,...”
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6by Port, Rebecca“...U.S. Department of the Interior, National Park Service, Natural Resource Stewardship and Science,...”
Published 2016
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7by Sullivan, Timothy J. (Timothy Joseph), 1950-“...U.S. Department of the Interior, National Park Service, Natural Resource Program Center,...”
Published 2011
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Government Document eBook