1. Letter from Ed Southern, Medical Research Council of Great Britain to Harold Varmus and Stephen Hughes Publication: Produced: 26 January 1978 Subject(s): Cloning, MolecularOncogenic Viruses Archival Collection: The Harold Varmus Papers (Profiles in Science)
2. Letter from Keith R. Yamamoto to Harold Varmus Publication: Produced: 5 October 1978 Subject(s): Oncogenic VirusesCloning, Molecular Archival Collection: The Harold Varmus Papers (Profiles in Science)
