71. Letter from Charles Yanofsky to Donald S. Fredrickson, National Institutes of Health Publication: Produced: 12 April 1977 Subject(s): DNA, RecombinantGuidelines as Topic Archival Collection: The Harold Varmus Papers (Profiles in Science)
72. Memorandum from Harold Varmus to Keith Hadley, Campus Biosafety Committee, University of California, San Francisco Publication: Produced: 12 October 1979 Subject(s): Hepatitis B virusGuidelines as Topic Archival Collection: The Harold Varmus Papers (Profiles in Science)
73. Letter from Harold Varmus to Donald S. Fredrickson, National Institutes of Health Publication: Produced: 14 December 1979 Subject(s): DNA, RecombinantGuidelines as Topic Archival Collection: The Harold Varmus Papers (Profiles in Science)