NATO Advanced Study Institute, McCormac, Billy Murray, Omholt, Anders, Norges landbrukshøgskole
Van Nostrand Reinhold Co
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Agricultural College of Sweden
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Montana Agricultural Experiment Station
Bozeman chronicle
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Illinois Agricultural Experiment Station College of Agriculture
University of Illinois, Agricultural Experiment Station
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University of Minnesota. Agricultural Experiment Station
Eagle Printing
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Organisation for Economic Co-operation and Development
OECD, for sale by OECD Publications Center]
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Bjanes, O. T.
J. W. Cappelens
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