1919260
9780874807820
Robert H. Webb is a research advisor with the U.S. Geological Survey in Tucson, Arizona Jayne Belnap is a biologist with the U.S. Geological Survey in Moab, Utah John S. Weisheit is a senior river guide and cofounder of Colorado Plateau River GuidesWebb, Robert H. is the author of 'Cataract Canyon A Human and Environmental History of the Rivers in Canyonlands', published 2004 under ISBN 9780874807820 and ISBN 0874807824.
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