TY  - BOOK
AU  - France J
AU  -  Thornley J H M
TI  - Mathematical models in agriculture:  A quantitative   
SN  - 0408108681
U1  - X9(J):(B), M4 
PY  - 1984///
CY  - London
PB  - Butterworths UK         
KW  - Agriculture Labour
N1  - Bib p. 313-30
ER  -