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1
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2by Heady, Earl O. (Earl Orel), 1916-1986Subjects: “...Farm management Research....”
Published 1956
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3
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4by Heady, Earl O. (Earl Orel), 1916-1986Subjects: “...Farm management Mathematical models....”
Published 1961
Book -
5Subjects: “...Farm management Iowa Iowa River Watershed Linear programming....”
Book