Dictionary of Agricultural and Environmental Science
by Frederick R. Troeh, Roy L. Donahue
ISBN 13: 9780813802831
Format: Illustrated (564 pages) Publisher: John Wiley & Sons Published: 01 Dec 2009
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Soils and Soil Fertility
by Frederick R. Troeh,Louis M. Thompson
ISBN 13: 9780813809557
Format: Illustrated (489 pages) Publisher: Blackwell Published: 17 Mar 2005