1. An Error in Model Building [Editorial letter]

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2. Circular letter from the European Committee of Scientists for Democracy in Greece

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3. DNA: Test of Structure? [Editorial letter]

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4. Evidence for the Pauling-Corey alpha-Helix in Synthetic Polypeptides [Editorial letter]

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5. Letter from A. V. Hill to Francis Crick

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6. Letter from Aaron Klug to Francis Crick

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7. Letter from Aaron Klug to Francis Crick

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8. Letter from Aaron Klug to Francis Crick

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9. Letter from Aaron Klug to Francis Crick

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10. Letter from Aaron Klug to Francis Crick

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11. Letter from Aaron Klug to Francis Crick

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12. Letter from Aaron Klug to Francis Crick

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13. Letter from Aaron Klug to Francis Crick

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14. Letter from Aaron Klug to Francis Crick

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15. Letter from Aaron Klug to Francis Crick

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16. Letter from Aaron Klug to Francis Crick

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17. Letter from Aaron Klug to Francis Crick

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18. Letter from Aaron Klug to Francis Crick

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19. Letter from Aaron Klug to Francis Crick

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20. Letter from Aaron Klug to Francis Crick

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