TY  - BOOK
AU  - Zandstra, H.G.,
TI  - A methodology for on-farm cropping systems research/ (Acc: D 1282)
U1  - 631.58 ZAN 22
PY  - 1981///
CY  - Philippines.
PB  - The International Rice Research Institute.
KW  - Farm cropping system
ER  -