1. Selected water-quality characteristics and flow of ground water in the San Luis Basin, including the Conejos River Subbasin, Colorado and New Mexico Author/Creator: Williams, Robert S., author Publication/Creation: Denver, Colorado : U.S. Geological Survey, 1989 Format: Book Access & Availability: Loading
2. Soil-water hydrology and geochemistry of a coal spoil at a reclaimed surface mine in Routt County, Colorado Author/Creator: Williams, Robert S., author Publication/Creation: Denver, Colorado : U.S. Geological Survey, 1988 Format: Book Access & Availability: Loading