@book{12375,
	author = {Gill, William R. and Vanden Berg, Glen E.,},
	title = {Soil dynamics in tillage and traction,},
	publisher = {Agricultural Research Service, U.S. Dept. of Agriculture; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.,},
	year = {1967]},
	series = {United States. Dept. of Agriculture. Agriculture handbook ;},
	address = {[Washington]}
}