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Start Over You searched for: Author Agricultural Research Administration Remove constraint Author: Agricultural Research Administration Publish Year Decade 1940 - 1949 Remove constraint Publish Year Decade: 1940 - 1949 Sudoc Stem A 77.517 Remove constraint Sudoc Stem: A 77.517

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1. Posters. Lettuce diseases: A, B, Downy mildew, C, D, Brown blight.

2. Posters. Lettuce diseases: Tipburn.

4. Posters. Sweetpotato diseases: Black rot, various stages of decay.