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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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3Published 2011“...U.S. Department of the Interior, National Park Service,...”
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4Published 2013“...U.S. Department of the Interior, National Park Service,...”
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5Published 2011“...U.S. Department of the Interior, National Park Service,...”
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6Published 2011“...National Park Service, U.S. Department of the Interior,...”
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7Published 2014“...National Park Service, U.S. Department of the Interior,...”
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8Published 2014“...National Park Service, U.S. Department of the Interior,...”
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9Published 2013“...National Park Service, U.S. Department of the Interior,...”
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10Published 2013“...National Park Service, U.S. Department of the Interior,...”
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11Published 2013“...National Park Service, U.S. Department of the Interior,...”
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12Published 2013“...National Park Service, U.S. Department of the Interior,...”
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13Published 1981“...National Park Service, U.S. Department of the Interior,...”
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14Published 1987“...National Park Service, U.S. Department of the Interior,...”
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15Published 2014“...National Park Service, U.S. Department of the Interior,...”
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16Published 2014“...National Park Service, U.S. Department of the Interior,...”
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17Published 1998“...National Park Service, U.S. Department of the Interior,...”
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18Published 2012“...National Park Service, U.S. Department of the Interior,...”
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19Published 2013“...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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