1. Letter from Richard Willstatter to Michael Heidelberger Publication: Produced: 25 October 1932 Subject(s): PolysaccharidesStreptococcus pneumoniae Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
2. Letter from Joshua Lederberg to Michael Heidelberger Publication: Produced: 12 November 1956 Subject(s): PolysaccharidesMolecular Structure Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
3. Letter from Michael Heidelberger to Joshua Lederberg Publication: Produced: 28 November 1956 Subject(s): PolysaccharidesMolecular Structure Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
4. Letter from Joshua Lederberg to Michael Heidelberger Publication: Produced: 30 November 1956 Subject(s): PolysaccharidesMolecular Structure Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
5. Letter from Colin M. MacLeod to Michael Heidelberger Publication: Produced: 20 May 1941 Subject(s): VaccinesPolysaccharidesPneumococcal Infections Archival Collection: The Michael Heidelberger Papers (Profiles in Science)