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641. Progress of plant breeding in the United States (id:IND43620772)

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642. Work in vegetable physiology and pathology (id:IND43620321)

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643. Improvement of plants by selection (id:IND43620374)

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644. Influence of environment in the origination of plant varieties (id:IND23337709)

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645. Seed production and seed saving (id:IND23339519)