TY  - BOOK
AU  - WEISCHET,WOLFGANG
AU  - CAVIEDES,CESAR N.
TI  - THE PERSISTING ECOLOGICAL CONSTRAINTS OF TROPICAL AGRICULTURE / 
U1  - 634.6 
PY  - 1993///
CY  - [S.N] : 
PB  - LONGMAN SCIENTIFIC AND TECHNICAL ، 
KW  - AGRICULTURE
KW  - TROPICS
ER  -