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4. Letter from Francis Crick to Paul Berg

6. Letter from Paul Berg to Daniel M. Singer

7. Letter from Daniel M. Singer to Paul Berg

8. Letter from Daniel M. Singer to Paul Berg

10. Lab notes on initial cell culture work

11. Lab notes on polyoma virus assay

12. Lab notes on second experiment with Py-6

13. Letter from Paul Berg to Francis Crick

14. Lab notes on polyoma plaque assay

15. Lab notes on assay of RNA-P preps

16. Letter from Paul Berg to Fred H. Bergmann

17. Letter from Paul Berg to Hans G. Boman

19. Letter from Theodore R. Breitman to Paul Berg