The U.S. Geological Survey Modular Ground-Water Model Pcgn: A Preconditioned Conjugate Gradient Solver with Improved Nonlinear Control: Usgs Open-File (Paperback)
Modflow-2000, the U.S. Geological Survey Modular Ground-Water Model: User Guide to Modularization Concepts and the Ground-Water Flow Process: Open-Fil (Paperback)
Demonstration Optimization Analyses of Pumping from Selected Arapahoe Aquifer Municipal Wells in the West-Central Denver Basin, Colorado, 2010-2109: U (Paperback)
Bibliography, Index, and Data Sources for Ground-Water Hydrology and Geology of Colorado West of the Continental Divide: Usgs Open-File Report 92-79 (Paperback)