http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Hydrochemical investigation of the Comal and Hueco spring systems, Comal County, Texas
Edwards Aquifer Research and Data Center
xiii, 182 pages : illustrations ; 28 cm.
Samuel R. Rothermal and Albert E. Ogden.