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21. Letter from Joshua Lederberg to Barton Childs

22. Letter from Joshua Lederberg to Barton Childs

23. Letter from Joshua Lederberg to Barton Childs

26. Letter from Joshua Lederberg to William R. Graham

27. Letter from Joshua Lederberg to Barbara MacKinnon

28. Letter from Joshua Lederberg to George Wald

30. A Definition of Biology