00814cam a2200229 4500 gs 65000359 DLC 20260227111417.0 690527s1964 kyuab b 00010 eng c gs 65000359 //r88 U.S. Geol. Survey. Library DLC QE115 .K4 no. 9 Helton, Walter L. Kentucky's rocks and minerals, by Walter L. Helton. Sketches by Roger B. Potts. [Lexington] University of Kentucky, 1964. 55 p. illus., maps. 22 cm. Kentucky. Geological Survey. Series X. Special publication 9 Bibliography: p. 53-55. Petrology Kentucky. Mineralogy Kentucky. Kentucky. University. Geological Survey. Series X. Special publication 9 30102 30102