TY  - BOOK
AU  - Gill,William R.
AU  - 
TI  - Soil dynamics in tillage and traction,
T2  - United States. Dept. of Agriculture. Agriculture handbook
AV  - S591 .G55
U1  - 631.5/1 
PY  - 1967///]
CY  - [Washington]
PB  - Agricultural Research Service, U.S. Dept. of Agriculture; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.
KW  - Soil dynamics
KW  - Tillage
KW  - Farm tractors
N1  - Bibliography: p. 460-487
ER  -