TY  - BOOK
AU  - Spedding,C.R.W.
TI  - An introduction to agricultural systems
SN  - 085334823 (paperback)
AV  - S493 S64 
PY  - 1979///
CY  - London
PB  - Applied Science Publishers
KW  - Agricultural systems
N1  - Includes bibliogrpahical reference and index
ER  -