TY  - BOOK
AU  - Shaner , W.W
AU  - Philipp , P.F
AU  - Schmehl , W.R
TI  - Farming systems research and development: guidelines for developing countries
SN  - 086531425x
U1  - 338.16 
CY  - USA
PB  - Westview
KW  - FARMING SYSTEMS
ER  -