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5. Letter from Francis Crick to Paul Berg

7. Letter from Paul Berg to Daniel M. Singer

8. Letter from Daniel M. Singer to Paul Berg

9. Letter from Daniel M. Singer to Paul Berg

11. Letter from Paul Berg to Francis Crick

12. Letter from Paul Berg to Fred H. Bergmann

13. Letter from Paul Berg to Hans G. Boman

15. Letter from Theodore R. Breitman to Paul Berg

17. Letter from Paul Berg to Francis Crick

18. Letter from Francis Crick to Paul Berg

19. Letter from Paul Berg to Daniel M. Singer

20. Letter from Francis Crick to Paul Berg