1. Variations in sand storage measured at monumented cross sections in the Colorado River between Glen Canyon Dam and Lava Falls Rapid, northern Arizona, 1992-99 Author/Creator: Flynn, Marilyn E. Publication/Creation: Denver, CO : U.S. Geological Survey, Information Services [distributor]. Resource Type: Book Access & Availability: Loading
2. Vulnerability of ground water to contamination, northern Bexar County, Texas Author/Creator: Clark, Amy R. 1961- (Amy Richter) Publication/Creation: Denver, CO : U.S. Geological Survey, Information Services [distributor]. Resource Type: Book Access & Availability: Loading
3. Vulnerability of ground water to contamination, northern Bexar County, Texas Author/Creator: Clark, Amy R. 1961- (Amy Richter) Publication/Creation: Austin, Tex. : U.S. Dept. of the Interior, U.S. Geological Survey, 2003 Resource Type: Book Access & Availability: Loading