1. Letter from Elvin A. Kabat to Michael Heidelberger Publication: Produced: [23 November 1937] Subject(s): Immune SeraAntibodiesMolecular Weight Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
2. Letter from Elvin A. Kabat to Michael Heidelberger Publication: Produced: [22 July 1938] Subject(s): Immune SeraAntibodiesCrystallography, X-RayMolecular Weight Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
3. Letter from Kai O. Pedersen to Michael Heidelberger Publication: Produced: 20 October 1936 Subject(s): AntibodiesMolecular WeightUltracentrifugation Archival Collection: The Michael Heidelberger Papers (Profiles in Science)
