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Titles
- Letter from Charles R. Burnham to Barbara McClintock1
- Letter from Lawrence Kolb to George W. McCoy1
- Letter from MacGregor Instrument Company to Michael E. DeBakey and William H. Gillentine1
- Letter from Michael E. DeBakey and William H. Gillentine to MacGregor Instrument Company1
- Letter from Michael E. DeBakey and William H. Gillentine to O. O. R. Schwidetzky1
- Letter from Michael E. DeBakey to his parents1
- Letter from Michael Heidelberger to Simon Flexner, Rockefeller Institute for Medical Research1
- Letter from O. O. R. Schwidetzky to Michael E. DeBakey4
- Letter from Simon Flexner, Rockefeller Institute for Medical Research to Michael Heidelberger1
- Letter from Wilbur A. Sawyer to Margaret Sawyer4
- Letter from Wilder Penfield to Alan Gregg1