Institute for Advanced Study (Princeton, N.J.)(Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA, 1/26/1942)
Institute for Advanced Study (Princeton, N.J.)(Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA, 12/14/1943)
Institute for Advanced Study (Princeton, N.J.)(Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA, 2/26/1943)
Institute for Advanced Study (Princeton, N.J.)(Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA, 4/20/1943)