1. Letter from Francis Crick to Alexander Rich Publication: Produced: 4 September 1974 Subject(s): RNA, TransferEthics, Professional Archival Collection: The Francis Crick Papers (Profiles in Science)
2. Letter from Alexander Rich to Francis Crick Publication: Produced: 9 August 1974 Subject(s): RNA, TransferEthics, Professional Archival Collection: The Francis Crick Papers (Profiles in Science)
3. Letter from Francis Crick to Alexander Rich Publication: Produced: 22 October 1974 Subject(s): RNA, TransferEthics, Professional Archival Collection: The Francis Crick Papers (Profiles in Science)
4. Letter from Alexander Rich to Francis Crick Publication: Produced: 11 October 1974 Subject(s): RNA, TransferEthics, Professional Archival Collection: The Francis Crick Papers (Profiles in Science)
5. Letter from Maxine Singer to James J. Castles Publication: Produced: 9 June 1966 Subject(s): Nucleic Acid HybridizationRNA, Transfer Archival Collection: The Maxine Singer Papers (Profiles in Science)