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1. Letter from Paul Berg to Fred H. Bergmann

2. Letter from Paul Berg to Hans G. Boman

4. Letter from Theodore R. Breitman to Paul Berg

6. Letter from Paul Berg to Francis Crick

7. Letter from Francis Crick to Paul Berg

8. Letter from Francis Crick to Paul Berg

11. Letter from Paul Berg to Alfred Tissieres

12. Letter from Paul Berg to Leon A. Heppel

14. Letter from Robert Langridge to Paul Berg

15. Letter from Paul Berg to Robert Langridge

16. Letter from Kenneth Murray to Paul Berg