1. Letter from James D. Watson to Rosalind Franklin Creator: Watson, James D., 1928-The California Institute of Technology. Kerckhoff Laboratories of Biology Date: 28 February 1955 Genre: Letters (correspondence)
2. Letter from Donald L. D. Caspar to Rosalind Franklin Creator: The California Institute of Technology. Kerckhoff Laboratories of BiologyCaspar, Donald L. D. Date: [ca. April-May 1955] Genre: Letters (correspondence)
3. Letter from Donald L. D. Caspar to Rosalind Franklin Creator: The California Institute of Technology. Kerckhoff Laboratories of BiologyCaspar, Donald L. D. Date: 9 April 1955 Genre: Letters (correspondence)
4. Letter from James D. Watson to Rosalind Franklin Creator: Watson, James D., 1928-The California Institute of Technology. Kerckhoff Laboratories of Biology Date: 9 April 1955 Genre: Letters (correspondence)