1. American Philosophical Society (1946) Muller letter to Stern. Stern Papers, Muller File—Box 16, 12 Nov
2. American Philosophical Society (1947a) Stern letter to Muller, 22 Jan 1947
3. American Philosophical Society (1947b) Stern letter to Muller, 23 July 1947
4. American Philosophical Society (1947c) Stern letter to Muller (cable), 7 Aug 1947
5. American Philosophical Society (1947d) Muller letter to Stern, 8 Aug 1947