21. Letter from John Desmond Bernal to J. T. Randall Publication: Produced: 28 October 1953 Subject(s): X-Ray DiffractionEquipment and Supplies Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
22. Letter from Albert Siegel to Rosalind Franklin Publication: Produced: 26 October 1954 Subject(s): Tobacco Mosaic VirusX-Ray Diffraction Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
23. Letter from Albert Siegel to Rosalind Franklin Publication: Produced: 23 February 1955 Subject(s): Tobacco Mosaic VirusX-Ray Diffraction Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
24. Letter from F. C. Bawden to Aaron Klug Publication: Produced: 1 May 1958 Subject(s): Tobacco Mosaic VirusPotexvirusX-Ray Diffraction Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
25. Letter from Donald L. D. Caspar to Rosalind Franklin Publication: Produced: 1 November 1954 Subject(s): Tobacco Mosaic VirusX-Ray Diffraction Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
26. Letter from Donald L. D. Caspar to Rosalind Franklin Publication: Produced: 9 April 1955 Subject(s): Tobacco Mosaic VirusX-Ray Diffraction Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
27. Letter from Donald L. D. Caspar to Rosalind Franklin Publication: Produced: [ca. April-May 1955] Subject(s): Tobacco Mosaic VirusX-Ray Diffraction Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
28. Letter from H. Fraenkel-Conrat to Rosalind Franklin Publication: Produced: 14 March 1956 Subject(s): Tobacco Mosaic VirusX-Ray Diffraction Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
29. Letter from C. A. Knight to Rosalind Franklin Publication: Produced: 3 December 1954 Subject(s): Tobacco Mosaic VirusX-Ray Diffraction Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
30. Letter from Robley Williams to Rosalind Franklin Publication: Produced: 6 January 1955 Subject(s): Tobacco Mosaic VirusX-Ray Diffraction Archival Collection: The Rosalind Franklin Papers (Profiles in Science)