Soil dynamics in tillage and traction /
Gill, William R.
Soil dynamics in tillage and traction / by William R. Gill and Glen E. Vanden Berg. - [Washington] : Agricultural Research Service, U.S. Dept. of Agriculture, 1967] - viii, 511 p. : ill. - United States. Dept. of Agriculture. Agriculture handbook ; no. 316 . - Agriculture handbook (United States. Dept. of Agriculture). .
Soil dynamics.
Tillage.
Farm tractors.
Soil dynamics in tillage and traction / by William R. Gill and Glen E. Vanden Berg. - [Washington] : Agricultural Research Service, U.S. Dept. of Agriculture, 1967] - viii, 511 p. : ill. - United States. Dept. of Agriculture. Agriculture handbook ; no. 316 . - Agriculture handbook (United States. Dept. of Agriculture). .
Soil dynamics.
Tillage.
Farm tractors.