TY  - BOOK
AU  - Spedding,C.R.W.
TI  - An introduction to agricultural systems
SN  - 0-85334-823-5
AV  - S 493 .S64 1979
U1  - 630 19
PY  - 1979///
CY  - London
PB  - Applied Science
KW  - Agricultural systems
N1  - Includes index; Bibliography: p. 162-164
ER  -