1. Letter from Harold Varmus to Girish N. Vyas Publication: Produced: 7 September 1977 Subject(s): Hepatitis B virusRNA, Viral Archival Collection: The Harold Varmus Papers (Profiles in Science)
2. Letter from Michael G. P. Stoker, Imperial Cancer Research Fund Laboratories to Harold Varmus Publication: Produced: 18 October 1977 Subject(s): Hepatitis B virusRNA, ViralAvian Sarcoma Viruses Archival Collection: The Harold Varmus Papers (Profiles in Science)
3. Letter from Harold Varmus to John S. Cole III, National Institutes of Health Publication: Produced: 11 May 1982 Subject(s): Hepatitis B virus Archival Collection: The Harold Varmus Papers (Profiles in Science)
4. Letter from Harold Varmus to Alan C. Davis, American Cancer Society Publication: Produced: 10 November 1982 Subject(s): RetroviridaeHepatitis B virus Archival Collection: The Harold Varmus Papers (Profiles in Science)