1. Letter from Daniel Nathans to Aaron J. Shatkin Publication: Produced: 23 January 1975 Subject(s): DNA, RecombinantGuidelines as TopicHazardous Substances Archival Collection: The Daniel Nathans Papers (Profiles in Science)
2. Open Letter to the Asilomar Conference on Hazards of Recombinant DNA Publication: Produced: [February 1975] Subject(s): DNA, RecombinantCongresses as TopicHazardous SubstancesGuidelines as Topic Archival Collection: The Maxine Singer Papers (Profiles in Science)