950 resultados para cotton aphid
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"January 1970."
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"February 1970."
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"December 1968."
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At head of title: U.S. Department of Agriculture. Office of Experiment Stations.
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Includes bibliographical references (p. 10-12).
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Mode of access: Internet.
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"December, 1930."
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"Under the direction of Emily L. Day."
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Originally issued Apr. 1946.