Accompanied by 3 foldouts. Plate VII : Graphic representations of water wells drilled south of the escarpment of the Llano Estacado in the southern part of the county. Plate VIII : Topographic and geologic cross sections. Plate IX : Geologic map of Potter County, Texas."Bureau of Economic Geology and Technology. Division of Economic Geology."
180,  p., 9 leaves of plates (3 fold.) : ill., maps ; 22 cm.