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＜図書＞
Soil dynamics in tillage and traction / by William R. Gill and Glen E. Vanden Berg.
(United States. Dept. of Agriculture. Agriculture handbook ; no. 316)

出版者	{Washington} : Agricultural Research Service, U.S. Dept. of Agriculture; {for sale by the Supt. of Docs., U.S. Govt. Print. Off.}
出版年	{1967}
大きさ	viii, 511 p : illus ; 24 cm.
著者標目	Gill, William R. Vanden Berg, Glen E.
件　名	Soil dynamics Tillage Farm tractors

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