1. Reconnaissance investigation of water-quality, bottom sediment, and biota associated with irrigation drainage in the Lower Rio Grande Valley and Laguna Atascosa National Wildlife Refuge, Texas, 1986-87 Author/Creator: Wells, Frank C., author Publication/Creation: Austin, Texas : U.S. Geological Survey, 1988 Resource Type: Book Access & Availability: Loading
2. Computation and use of volume-weighted-average concentrations to determine long-term variations of selected water-quality constituents in lakes and reservoirs Author/Creator: Wells, Frank C., author Publication/Creation: Austin, Texas : U.S. Geological Survey, 1984 Resource Type: Book Access & Availability: Loading
3. Statistical summary of daily values data and trend analysis of dissolved-solids data at National Stream Quality Accounting Network (NASQAN) stations Author/Creator: Wells, Frank C., author Publication/Creation: Austin, Texas : U.S. Geological Survey, 1983 Resource Type: Computer File Access & Availability: Loading