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22. Letter from Barbara McClintock to William L. Brown
23. Letter from William L. Brown to Almiro Blumenschein
24. Letter from Major M. Goodman to William L. Brown
25. Letter from Barbara McClintock to William L. Brown
26. Letter from Barbara McClintock to William L. Brown
27. Letter from Charles R. Burnham to Barbara McClintock
28. Letter from Charles R. Burnham to Barbara McClintock
29. Letter from Charles R. Burnham to Barbara McClintock
30. Letter from Charles R. Burnham to Barbara McClintock
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