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3. Letter from Julian B. Fleischman to Paul Berg

4. Letter from Maxine Singer to Paul Berg

5. Letter from Paul Berg to Maxine Singer

6. Letter from Francis Crick to Igor Y. Tamm

14. Letter from Francis Crick to Severo Ochoa

15. Letter from Severo Ochoa to Francis Crick

16. Letter from Francis Crick to Severo Ochoa

18. Towards the Genetic Code

19. Cracking the Genetic Code

20. Properties of Ribosomes