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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