Richards, Bryant N <br/><br/>
Introduction to the soil ecosystem 
B. N. Richards 
 - London  Longman Group  1974 
 - x, 266 p. : ill. ; 22 cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>ISBN: </label>0582441307 
<br/><br/><label>LCCN: </label>73-085688 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soil ecology