TY  - BOOK
AU  - Spedding,C.R.W.
TI  - An introduction to agricultural systems
SN  - 0853348235
PY  - 1979///
CY  - London
PB  - Applied Science Publishers
KW  - Agriculture
KW  - System analysis
N1  - Includes index; Bibliograhy: p. 162-166
ER  -