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22. Letter from Theodore R. Breitman to Paul Berg

24. Letter from Paul Berg to Francis Crick

25. Letter from Francis Crick to Paul Berg

26. Letter from Paul Berg to Daniel M. Singer

27. Letter from Francis Crick to Paul Berg

28. Letter from Francis Crick to Paul Berg

29. Letter from Paul Berg to Julian B. Fleischman

30. Letter from Julian B. Fleischman to Paul Berg