Charles Walker

US Geological Survey
MD-DE-DC Water Science Center
5522 Research Park Drive
Baltimore, MD
USA 21228
Email: cwwalker@usgs.gov

Papers:
113-2 Introductory Soils On Penn State's World Campus.
114-1 Shovels and Laptops: The Success of Hands-On Labs in Online Soils 101 at Penn State's World Campus.
251-8 The Occurrence of Carbamazepine in Wastewater Irrigated Soils: Effects of Land Use.