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.:  illus., maps.;  23 cm. 
 - FAO agricultural development paper ;  no.83 .
<br/><br/>Bibliography: p. 148-161 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clay<br/>Soils--Tropics