Agricultural intensification and environment in tropical areas /    
Edited by R. Dellere and J. J. Symoens. 
 - Leiden:   Technical Centre for Agricultural and Rural Co-operation   1991. 
 - 202 p. :    ill ;    25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural intensification --------Congresses.<br/>Environmental protection --------Congresses.