TY  - BOOK
AU  - SANCHEZ, Pedro A
TI  - Properties and management of soils in the tropics
U1  - 631.4 (213.5) 
PY  - 1976///
CY  - New York
PB  - John Wiley
KW  - Multiple cropping
KW  - Soil fertility
KW  - Tropical soils
ER  -