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11. Letter from Paul Berg to Hans G. Boman

13. Letter from Theodore R. Breitman to Paul Berg

15. Letter from Paul Berg to Francis Crick

16. Letter from Francis Crick to Paul Berg

17. Letter from Paul Berg to Daniel M. Singer

18. Letter from Francis Crick to Paul Berg

19. Letter from Francis Crick to Paul Berg

20. Letter from Paul Berg to Julian B. Fleischman