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by N. C. Brady
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Advances in agronomy
Donald L. Sparks
Plant Breeding Reviews Vol. 9
Jules Janick
Soil and Environmental Analysis
Keith A. Smith
Agroecology
Stephen R. Gliessman
Princeton University Latin American microfilm collection
Scholarly Resources Inc
A croft in the hills
Katharine Stewart
Vegetation and soils
S. R. Eyre
Plant Breeding Reviews