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1Published 1989“...[National Park Service],...”
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2Published 1965“...National Park Service,...”
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3by Unrau, Harlan D.“...Denver Service Center, National Park Service,...”
Published 1983
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4by Clemensen, A. Berle“...National Park Service, Denver Service Center,...”
Published 1986
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5Published 1991“...National Park Service, Denver Service Center,...”
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6Published 1989“...[National Park Service, Denver Service Center],...”
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7Published 1993“...[National Park Service, Denver Service Center],...”
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8Published 1993“...[National Park Service, Denver Service Center?],...”
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9Published 1994“...[National Park Service, Denver Service Center],...”
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10Published 1998“...National Park Service, Denver Service Center,...”
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11Published 1997“...National Park Service, Denver Service Center,...”
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12Published 2001“...[National Park Service, Denver Service Center],...”
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13Published 2001“...National Park Service, Dept. of the Interior,...”
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14Published 1989“...[United States National Park Service],...”
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15Published 2002“...[U.S. National Park Service, Denver Service Center?],...”
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16Published 1985“...U.S. Dept. of the Interior, National Park Service,...”
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17Published 1992“...U.S. Dept. of the Interior, National Park Service,...”
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18Published 1983“...U.S. Dept. of the Interior, National Park Service,...”
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19Published 1996“...U.S. Dept. of the Interior, National Park Service,...”
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