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1Published 1981“...U.S. Department of the Interior, National Park Service :...”
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2Published 2012“...[U.S. Department of the Interior, National Park Service],...”
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3
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4Published 2012“...National Park Service, U.S. Department of the Interior,...”
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5Published 2014“...U.S. Department of the Interior, National Park Service,...”
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6Published 2014“...U.S. Department of the Interior, National Park Service,...”
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7Published 2008“...National Park Service, U.S. Department of the Interior,...”
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8Published 2011“...National Park Service, U.S. Department of the Interior,...”
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9Published 2014“...National Park Service, U.S. Department of the Interior,...”
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10
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11Published 2012“...National Park Service, U.S. Department of the Interior,...”
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12Published 2015“...National Park Service, U.S. Department of the Interior,...”
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13Published 2011“...National Park Service, U.S. Department of the Interior,...”
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14
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15
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16Published 2007“...National Park Service, U.S. Department of the Interior,...”
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17
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18
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19
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20
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