LAL , R . <br/><br/>
SOIL AND WATER CONSERVATION AND MANAGEMENT IN THE HUMID AND SUBHUMID TROPICS 
R . LAL  
 - IBADAN  INTERNATIONAL INSTITUTE OF TROPICAL AGRICULTURE  1983 
 - viii ,64p.:ill.;  Hbk 
<br/><br/><label>LC Class. No.: </label>S623 .L3 1983