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 A. D. Hershey to Michael Heidelberger Publication: Produced: [10 April 1941] Subject(s): Antigen-Antibody ReactionsBacteriophagesKinetics Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
3. Letter from A. D. Hershey to Michael Heidelberger Publication: Produced: 1 May 1941 Subject(s): Antigen-Antibody ReactionsBacteriophagesKinetics Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
4. Letter from A. D. Hershey to Michael Heidelberger Publication: Produced: 4 August 1942 Subject(s): Antigen-Antibody ReactionsBacteriophagesKinetics Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
5. Letter from Kai O. Pedersen to Michael Heidelberger Publication: Produced: 6 December 1939 Subject(s): World War IIPoliticsAntigen-Antibody Reactions Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
6. Letter from Florence R. Sabin to Michael Heidelberger Publication: Produced: 24 October 1941 Subject(s): Antigen-Antibody Reactions Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
7. 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)
8. Letter from Max Delbruck, California Institute of Technology to Michael Heidelberger Publication: Produced: 16 March 1938 Subject(s): Antigen-Antibody ReactionsPrecipitins Archival Collection: The Michael Heidelberger Papers (Profiles in Science)