AU  - Heaton,W.R.
TI  - Farming calcultions / 
T2  - Pitman farming books
U1  - 338.1 
PY  - 1948///
CY  - London : 
PB  - Sir Isaac Pitman and Sons Limited, 
KW  - Agric, Economics
KW  - Calcultions-Farming
ER  -