Bulletin 6004 by Kenneth J. DeCook, U.S. Geological Survey | June 1960

• Bulletin 6004 - Geology and Ground-Water Resources of Hays County, Texas (pdf - 24.8MB)
• Plate 1 Geologic map showing wells and springs in Hays county
• Plate 2 Geologic map of the Southeastern part of Hays county