1. Drawing of the double helix

Date:

[ca. 1953]

2. Letter from Francis Crick to James D. Watson

Date:

10 March 1966

3. Letter from Francis Crick to James D. Watson

Date:

27 September 1966

4. Letter from Francis Crick to Igor Y. Tamm

Date:

5 December 1962

5. Letter from Francis Crick to Andrew Poggenpohl, National Geographic Magazine

Date:

19 August 1974

6. Letter from Francis Crick to Harold Himsworth, Medical Research Council of Great Britain

Date:

15 June 1953

7. Letter from Francis Crick to James D. Watson

Date:

13 April 1967

8. Letter from Francis Crick to Lawrence Bragg

Date:

23 February 1967

9. Letter from Francis Crick to Maurice Wilkins

Date:

19 January 1967

10. Letter from Francis Crick to Nathan M. Pusey, Harvard University

Date:

23 December 1966

11. Letter from Francis Crick to Nathan M. Pusey, Harvard University

Date:

1 December 1966

12. Letter from Francis Crick to James D. Watson

Date:

1 November 1966

13. Letter from Francis Crick to James D. Watson

Date:

10 October 1966

14. Letter from Francis Crick to Thomas J. Wilson, Harvard University Press

Date:

21 October 1966

15. Letter from Francis Crick to James D. Watson (and notes concerning Watson's book, "The Double Helix")

Date:

31 March 1966

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

Date:

5 June 1953

17. Letter from Francis Crick to Maurice Wilkins

Date:

30 October 1962

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

Date:

2 October 1979

19. [Notebook entry on] "DNA"

Date:

14 December 1951

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

Date:

[ca. 1953]