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2Published 1956“...National Park Service,...”
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4Published 1967“...National Park Service,...”
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6Published 1990“...National Park Service,...”
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7Published 1988“...National Park Service,...”
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8Published 1991“...[National Park Service],...”
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9Published 1997“...National Park Service :...”
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10Published 1979“...National Park Service,...”
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13Published 1986“...National Park Service,...”
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16Published 2003“...National Park Service,...”
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17by Mackintosh, Barry“...National Park Service,...”
Published 2000
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