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1Published 1981“...U.S. Department of the Interior, National Park Service :...”
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2Published 2011“...U.S. Department of the Interior, National Park Service,...”
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3Published 2013“...U.S. Department of the Interior, National Park Service,...”
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4Published 2011“...National Park Service, U.S. Department of the Interior,...”
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5Published 1981“...National Park Service, U.S. Department of the Interior,...”
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6Published 1987“...National Park Service, U.S. Department of the Interior,...”
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7Published 2015“...U.S. Department of the Interior, National Park Service,...”
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8Published 2016“...National Park Service, U.S. Department of the Interior,...”
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9
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10Published 2008“...National Park Service, U.S. Department of the Interior,...”
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11Published 2011“...National Park Service, U.S. Department of the Interior,...”
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12Published 2014“...National Park Service, U.S. Department of the Interior,...”
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13
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14by Rockman, Marcy, 1971-“...National Park Service, U.S. Department of the Interior,...”
Published 2016
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15Published 2017“...National Park Service, U.S. Department of the Interior,...”
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16Published 2012“...National Park Service, U.S. Department of the Interior,...”
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17Published 2015“...National Park Service, U.S. Department of the Interior,...”
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18Published 1972“...[U.S. Department of the Interior, National Park Service],...”
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19Published 2011“...National Park Service, U.S. Department of the Interior,...”
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20by Rockman, Marcy, 1971-“...National Park Service, U.S. Department of the Interior,...”
Published 2016
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