TY  - BOOK
AU  - WELSCHET, W AND CAVIEDES , C.N
TI  - THE PREISTING ECOLOGY CONSTRAINT OF TROPICAL AGRICULTURE
SN  - 0582056926
AV  - QH541.5T7.W4 1993 
PY  - 1993///
CY  - NEW YORK
PB  - LONGM,AN SCIENTIFIC
ER  -