Clay :  types, properties, and uses / 
editors, Justin P. Humphrey and Daniel E. Boyd 
 - xv, 493 pages. :  illustrations. (some color.), maps ;  26 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9781613244494 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clay.