Van Straaten Peter. <br/><br/>
Agrogeology:  the use of rocks for crops, 
by Peter van Straaten. 
 - Ontario:   Enviroquest ltd,  2007 
 - vi,440p.:   ill. 
<br/><br/>includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0968012353. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Phosphate rock .<br/>Phosphatic fertilizers .
<br/><br/><label>LC Class. No.: </label>S 633.5 VAN 2007.