TY  - BOOK
AU  - Dudal,R.
TI  - Dark clay soils of tropical and subtropical regions / 
PY  - 1965///
CY  - Rome : 
PB  - Food and Agriculture Organization of the United Nations , 
KW  - Clay
KW  - Addresses, essays, lectures
KW  - Soils
N1  -  Includes bibliographical references : p.148-161
ER  -