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1
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2
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3by Porter, Charles W.“...Division of Publications, National Park Service, U.S. Dept. of the Interior /,...”
Published 1985
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4by 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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5by 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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6“...U.S. Department of the Interior, National Park Service, Natural Resource Stewardship and Science,...”
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7by Sundin, Gary“...U.S. Department of the Interior, National Park Service, Natural Resource Stewardship and Science,...”
Published 2013
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