Dark clay soils of tropical and subtropical regions /    
edited by R . Dudal under the general direction of Luis Bramao. 
 - Rome :   Food and Agriculture Organization of the United Nations ,   1965. 
 - x, 161 p. :    ill., maps ;    23 cm. 
 - FAO Agricultural development paper, no.83.   .
<br/><br/>Includes bibliographical references : p.148-161. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clay.--------Addresses, essays, lectures.<br/>Soils --------Addresses, essays, lectures.