TY  - BOOK
AU  - United Kingdom. Ministry of Agriculture, Fisheries and Food.
TI  - Tractor ploughing
U1  - PH 631.312.4(04) K2 
PY  - 1962///
CY  - London
PB  - HMSO
KW  -  J.C.Hawkins
KW  - Tractor,Plough,Agronomy
ER  -