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1by Wing, Kittridge A.“...National Park Service,...”
Published 1955
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2Published 1976“...National Park Service,...”
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6Published 1990“...Petroglyph National Monument, National Park Service,...”
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7Published 2001“...National Park Service, Dept. of the Interior,...”
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8Published 2011“...National Park Service, U.S. Dept. of the Interior, Carlsbad Caverns National Park,...”
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9Published 2002“...[U.S. National Park Service, Denver Service Center?],...”
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10by Utley, Robert M., 1929-“...U. S. Dept. of the Interior, National Park Service,...”
Published 1962
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11by Lekson, Stephen H.“...National Park Service, U.S. Dept. of the Interior,...”
Published 1984
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12by Brugge, David M.“...U.S. Dept. of the Interior, National Park Service ;...”
Published 1980
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13Published 1985“...U.S. Dept. of the Interior, National Park Service,...”
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14by Brugge, David M.“...U.S. Dept. of the Interior, National Park Service :...”
Published 1986
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15Published 1986“...National Park Service, U.S. Dept. of the Interior,...”
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16by McKenna, Peter J.“...National Park Service, U.S. Dept. of the Interior,...”
Published 1986
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17Published 1985“...U.S. Dept. of the Interior, National Park Service,...”
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18Published 1987“...National Park Service, U.S. Dept. of the Interior,...”
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19Published 1988“...Southwest Regional Office, National Park Service,...”
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20Published 1991“...U.S. Dept. of the Interior, National Park Service,...”
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