Helton, Walter L. <br/><br/>
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 .
 - Kentucky.  University.  Geological Survey.  Series X. Special publication  9 .
<br/><br/>Bibliography: p. 53-55. 
<br/><br/><label>LCCN: </label>gs 65000359 //r88 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Petrology--Kentucky.<br/>Mineralogy--Kentucky.
<br/><br/><label>LC Class. No.: </label>QE115  / .K4 no. 9