TY  - BK
AU  - Martin,M.E.
TI  - 25 rules for efficient tractor operation
U1  - 82-718762 
PY  - 1980///
KW  - Agricultural machinery and equipment
KW  - Transportation equipment
T2  - Leaflet - University of California, Cooperative Extension Service (USA). no. 21160 Jul 1980. 3 p
ER  -