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Roy Luther Donahue
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Soils
Roy Luther Donahue · Prentice-Hall
626 sayfa · 1958
Soil science / Crops and soils / Soil management / Soils / Relations plante-sol
Our soils and their management
Roy Luther Donahue · Interstate Publishers
608 sayfa · 1955
Water conservation / Soil science / Soil management / Crops and soils / Soils
Dictionary of agricultural and environmental science / Frederick R. Troeh and Roy L. Donahue
Frederick R. Troeh, Roy Luther Donahue · Iowa State Press
553 sayfa · 2003
Agriculture / Dictionaries / Environmental sciences / Agriculture, dictionaries, indexes, etc. / Dictionnaires anglais
The range and pasture book
Roy Luther Donahue · Prentice-Hall
406 sayfa · 1956
Pastures / Forage plants / Textbooks / Agriculture
Soils of Equatorial Africa and their revelance to rational agricultural development
Roy Luther Donahue · Michigan State University, Dept. of Crop and Soil Sciences
52 sayfa · 1970
Soils / Africa