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1Published 1998“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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2Published 1992“...U.S. Dept. of the Interior, U.S. Geological Survey :...”
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3Published 1995“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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4Published 1995“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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5by Wiele, Stephen Mark“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 1998
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6Published 1995“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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7Published 1995“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
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8Published 1999“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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9by Webb, Robert H.“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 2003
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10by Chenoweth, William L.“...Dept. of the Interior, U.S. Geological Survey :...”
Published 1986
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11by Webb, Robert H.“...Dept. of the Interior, U.S. Geological Survey ;...”
Published 1989
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12by Marley, Margie“...Dept. of the Interior, U.S. Geological Survey :...”
Published 1987
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13by Kieffer, Susan W.“...Dept. of the Interior, U.S. Geological Survey :...”
Published 1987
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14by Carpenter, Michael C.“...U.S. Dept. of the Interior, U.S. Geological Survey ; U.S. Geological Survey, Open-File Section,...”
Published 1995
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15by Graf, Julia B.“...Grand Canyon Monitoring and Research Program, U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 1997
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