Robert H Webb

• Climatic variability and flood frequency of the Santa Cruz River, Pima County, Arizona
• Debris flows from tributaries of the Colorado River, Grand Canyon National Park, Arizona
• Distribution of radionuclide and trace-elements in ground water, grasses, and surficial sediments associated with the alluvial aquifer along the Puerco River, northeastern Arizona
• Preliminary assessment of water quality in the alluvial aquifer of the Puerco River basin, Northeastern Arizona
• Reworking of aggraded debris fans by the 1996 controlled flood on the Colorado River in Grand Canyon National Park, Arizona
• Sediment delivery by ungaged tributaries of the Colorado River in Grand Canyon, Arizona
• The Great Cataract