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Titles
- Letter from Barbara McClintock to Curt Stern5
- Letter from Wilbur A. Sawyer to Margaret Sawyer2
- Letter from Curt Stern to Barbara McClintock1
- Letter from Fred E. Wright, National Academy of Sciences to Oswald T. Avery1
- Letter from MacGregor Instrument Company to Michael E. DeBakey and William H. Gillentine1
- Letter from O. O. R. Schwidetzky to Michael E. DeBakey1
- Letter from Oswald T. Avery to Fred E. Wright, National Academy of Sciences1
- Letter to Henry Swan from his father1