1. Letter from Felix Haurowitz to Michael Heidelberger Publication: Produced: 10 February 1948 Subject(s): Allergy and ImmunologyAntigen-Antibody Reactions Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
2. Letter from Simon Flexner, Rockefeller Institute for Medical Research to Michael Heidelberger Publication: Produced: 23 June 1924 Subject(s): Crystallography, X-RayAllergy and Immunology Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
3. Letter from Baruj Benacerraf to Michael Heidelberger Publication: Produced: 30 November 1953 Subject(s): Awards and PrizesAllergy and Immunology Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
4. Letter from William C. Boyd, Boston University to Michael Heidelberger Publication: Produced: 10 December 1940 Subject(s): PrecipitinsAgglutinationAntigen-Antibody ReactionsAllergy and Immunology Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
5. Letter from Simon Flexner to Michael Heidelberger Publication: Produced: 11 August 1943 Subject(s): Allergy and Immunology Archival Collection: The Michael Heidelberger Papers (Profiles in Science)