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1Published 1982“...National Park Service, U.S. Department of the Interior,...”
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2Published 1982“...National Park Service, U.S. Department of the Interior,...”
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3by Everhart, William C.“...U.S. Department of Interior, National Park Service,...”
Published 1954
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4Published 1981“...U.S. Department of the Interior, National Park Service :...”
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5by Unrau, Harlan D.“...U.S. Department of the Interior, National Park Service,...”
Published 1991
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6Published 2012“...U.S. Department of the Interior, National Park Service,...”
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7Published 2011“...U.S. Department of the Interior, National Park Service,...”
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8by Patrick, Andrew“...U.S. Department. of the Interior, National Park Service,...”
Published 2012
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9Published 2011“...U.S. Department of the Interior, National Park Service,...”
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10Published 2013“...U.S. Department of the Interior, National Park Service,...”
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11Published 2011“...U.S. Department of the Interior, National Park Service,...”
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12Published 2005“...U.S. Department of the Interior, National Park Service,...”
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13Published 2007“...[U.S. Department of the Interior, National Park Service],...”
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14“...U.S. Department of the Interior, National Park Service,...”
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15by Patrick, Andrew“...National Park Service, U.S. Department of the Interior,...”
Published 2002
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16Published 2011“...National Park Service, U.S. Department of the Interior,...”
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17Published 2014“...National Park Service, U.S. Department of the Interior,...”
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18Published 2014“...National Park Service, U.S. Department of the Interior,...”
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19Published 2011“...National Park Service, U.S. Department of the Interior,...”
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20Published 2013“...National Park Service, U.S. Department of the Interior,...”
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