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6. Letter from Francis Crick to Paul Berg

8. Letter from Paul Berg to Daniel M. Singer

9. Letter from Daniel M. Singer to Paul Berg

10. Letter from Daniel M. Singer to Paul Berg

13. Lab notes on initial cell culture work

14. Lab notes on polyoma virus assay

15. Lab notes on second experiment with Py-6

16. Letter from Paul Berg to Francis Crick

17. Lab notes on polyoma plaque assay

18. Lab notes on assay of RNA-P preps

19. Letter from Paul Berg to Fred H. Bergmann

20. Letter from Paul Berg to Hans G. Boman