Report 67 by Donald Leifeste and Leon S. Hughes, U.S. Geological Survey, December 1967

• Report 67 - Reconnaissance of the Chemical Quality of Surface Waters of the Trinity River Basin, Texas (pdf - 12.0MB)
• Figure 2 (pdf - 0.63MB) - Precipitation and Runoff in the Trinity River Basin
• Figure 4 (pdf - 0.50MB) - Major Reservoirs and Potential Reservoir Sites in the Trinity River Basin
• Figure 7 (pdf - 0.52MB) - Generalized Map of Oil and Gas Fields
• Figure 9 (pdf - 0.85MB) - Geologic Map of Trinity River Basin Showing Streamflow and Chemical-Quality Data-Collection Sites as of December 1965
• Figure 10 (pdf - 0.58MB) - Dissolved-Solids Concentrations of Surface Waters in the Trinity River Basin
• Figure 11 (pdf - 0.70MB) - Hardness of Surface Water in the Trinity River Basin
• Figure 12 (pdf - 0.63MB) - Chloride Concentrations of Surface Water in the Trinity River Basin