31. Letter from Francis Crick to Rosalind Franklin (and notes on two papers by Franklin and Raymond Gosling)

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32. Letter from Francis Crick to Maurice Wilkins

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33. Letter from Francis Crick to the Editor of The Sciences

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34. Letter from Margaret Markham to Francis Crick

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35. Letter from Charlotte Friend to Francis Crick

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36. Letter from Aaron Klug to Francis Crick

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37. [Notebook entry on] "DNA"

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38. Fragment of notes on a double helix model for DNA

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39. A Structure for DNA (draft)

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40. The Complementary Structure of Deoxyribonucleic Acid

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