Keller, Edward A., 1942- <br/><br/>
Environmental geology 
Edward A. Keller 
 - 5th ed. 
 - Columbus, Ohio  Merrill  1988 
 - 540 p. : ill. ; 28 cm. 
<br/><br/><label>ISBN: </label>0675208890 
<br/><br/><label>LCCN: </label>87-62225 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology<br/>Environmental protection