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Titles
- Letter from Alexander Makinsky to Alan Gregg1
- Letter from Allen O. Whipple to Virginia Apgar1
- Letter from Charles A. Doan to Florence R. Sabin1
- Letter from Charles D. Hurd, Northwestern University to Michael Heidelberger1
- Letter from Charles R. Drew to Lenore (Robbins) Drew3
- Letter from Courtenay Crocker to Wilbur A. Sawyer1
- Letter from Hugh S. Taylor, Princeton University to Michael Heidelberger1
- Letter from Kai O. Pedersen to Michael Heidelberger1
- Letter from Karl A. Connell to Virginia Apgar2
- Letter from Lewis Hackett to Fred L. Soper1
- Letter from Linus Pauling to Warren Weaver3
- Letter from Percival Hartley, Medical Research Council of Great Britain to Michael Heidelberger1
- Letter from Ralph M. Waters to Virginia Apgar1
- Letter from Virginia Apgar to Allen O. Whipple1
- Letter from Virginia Apgar to Karl A. Connell1