Bulletin 6017 by C.C. Mason, U.S. Geological Survey | February 1961

• Bulletin 6017 - Ground-Water Geology of the Hickory Sandstone Member of the Riley Formation, McCulloch County, Texas (pdf - 6.91MB)
• Figure 6 (pdf - 10.7MB) - Geologic Section Along Line B-B', McCulloch County, Texas
• Plate 1 (pdf - 12.5MB) - Geology of Pre-Cambrian, Cambrian and Quarternary Rocks. Geology of Younger Paleozoic and Cretaceous Rocks after Plummer, 1943
  • Plate 1a (pdf - 12.4MB) - Continued