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)
