Characterization of soils in relation to their classification and management for crop production :  examples from some areas of the humid tropics / 
edited by D. J. Greenland 
 - Oxford :  Clarendon Press,  1981 
 - 446 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographies 
<br/><br/><label>ISBN: </label>019854538X 
<br/><br/><label>LCCN: </label>79-040672 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soils--Nigeria<br/>Soil fertility