※一部利用できない機能があります
1.
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United States. Dept. of Agriculture
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2.
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prepared in cooperation with the American Society of Agronomy ; edited by A.G. Norman
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3.
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United States of Department of Agriculture
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4.
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edited by Florence A. Arnold and Hazel L. Lewis
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5.
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by Earley Vernon Wilcox
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6.
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by Howard R. Tolley
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7.
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[by] Agricultural Experiment Station, Iowa State College of Agriculture and Mechanic Arts
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