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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