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＜図書＞
Our soils and their management; increasing production through soil and water conservation / by Roy L. Donahue.

版	{3d ed.}
出版者	Danville, Ill. : Interstate
出版年	{1970}
大きさ	683 p. illus. 24 cm.
著者標目	Donahue, Roy Luther, 1908-
件　名	Soil science Soil management Crops and soils Water conservation
一般注記	Includes bibliographies.

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