1. Letter from Rosalind Franklin to H. Fraenkel-Conrat Publication: Produced: 21 February 1956 Subject(s): Tobacco Mosaic VirusRNAX-Ray Diffraction Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
2. Note on the Future of the A.R.C. Research Group in Birkbeck College Crystallography Laboratory Publication: Produced: 9 March 1956 Subject(s): RNATobacco Mosaic VirusCrystallography, X-RayX-Ray DiffractionResearch Support as Topic Archival Collection: The Rosalind Franklin Papers (Profiles in Science)
3. 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)
4. Letter from Francis Crick to Sol Spiegelman Publication: Produced: 19 October 1956 Subject(s): RNADNAProteins Archival Collection: The Sol Spiegelman Papers (Profiles in Science)