TY  - BOOK
AU  - Gilbert,E.H.
AU  - Norman,D.W.
AU  - Winch,F.E.
TI  - Farming systems research: a critical appraisal
AV  - ERB PAM S494.G542 
PY  - 1980///
CY  - Michigan
PB  - Michigan State University
KW  - Farming system research
ER  -