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1Published 1997“...[U.S. Dept. of the Interior, National Park Service],...”
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3Published 1998“...U.S. Dept. of the Interior, National Park Service,...”
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4Published 1998“...U.S. Dept. of the Interior, National Park Service,...”
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5Published 1999“...U.S. Dept. of the Interior, National Park Service,...”
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6Published 1998“...U.S. Dept. of the Interior, National Park Service,...”
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7Published 1999“...U.S. Dept. of the Interior, National Park Service,...”
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8Published 1935“...U.S. Dept. of the Interior, National Park Service,...”
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9by Utley, Robert M., 1929-“...U. S. Dept. of the Interior, National Park Service,...”
Published 1962
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10by Lekson, Stephen H.“...National Park Service, U.S. Dept. of the Interior,...”
Published 1984
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11by Utley, Robert M., 1929-“...U.S. Dept. of the Interior, National Park Service,...”
Published 1965
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12by Singer, Francis J.“...U.S. Dept. of the Interior, National Park Service,...”
Published 1975
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13Published 1976“...U.S. Dept. of the Interior, National Park Service,...”
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14by Lewis, Ralph H.“...U.S. Dept. of the Interior, National Park Service,...”
Published 1976
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15Published 1976“...[U.S. Dept. of the Interior, National Park Service],...”
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16Published 1975“...[U.S. Dept. of the Interior, National Park Service],...”
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17by Johnson, A. Sydney (Albert Sydney)“...U.S. Dept. of the Interior, National Park Service,...”
Published 1974
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18by Krausman, Paul R., 1946-“...U.S. Dept. of the Interior, National Park Service :...”
Published 1981
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19Published 1981“...National Park Service, U.S. Dept. of the Interior,...”
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20Published 1981“...National Park Service, U.S. Dept. of the Interior,...”
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