1. Letter from Natalie Teich, Imperial Cancer Research Fund Laboratories to Harold Varmus Publication: Produced: 7 September 1982 Subject(s): RetroviridaeTerminology as Topic Archival Collection: The Harold Varmus Papers (Profiles in Science)
2. Letter from Natalie Teich, Imperial Cancer Research Fund Laboratories to Harold Varmus Publication: Produced: 22 April 1985 Subject(s): RetroviridaeTerminology as Topic Archival Collection: The Harold Varmus Papers (Profiles in Science)