41. 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)
42. 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)
43. Letter from Donald L. D. Caspar to Rosalind Franklin Publication: Produced: [1956] Subject(s): Tobacco Mosaic VirusRNA Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
44. Letter from L. H. Gray to Rosalind Franklin Publication: Produced: 25 February 1957 Subject(s): Tobacco Mosaic VirusCrystallography, X-Ray Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
45. Letter from L. H. Gray to Rosalind Franklin Publication: Produced: 20 March 1957 Subject(s): Tobacco Mosaic VirusCrystallography, X-Ray Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
46. Letter from H. Fraenkel-Conrat to Rosalind Franklin Publication: Produced: 10 May 1955 Subject(s): Tobacco Mosaic Virus Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
47. Letter from H. Fraenkel-Conrat to Rosalind Franklin Publication: Produced: 20 October 1955 Subject(s): Tobacco Mosaic Virus Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
48. 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)
49. 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)
50. Letter from C. A. Knight to Rosalind Franklin Publication: Produced: 11 January 1955 Subject(s): Tobacco Mosaic VirusRNA Archival Collection: The Rosalind Franklin Papers (Profiles in Science)