- FondsMordell - Papers of Louis Joel Mordell
- Series1-40 - Letters
- File19 - Miscellaneous Letters
- 102 more...
- Item19.103 - A.L.s., in German, from Oskar Perron, Diessen am Ammersee
- Item19.104 - A.L.s., from H. Petersson, Hamburg
- Item19.105 - A.L.s., in German, from K. Petr, University of Strasbourg
- Item19.106 - T.L.s., from B. van der Pol, Geneva
- Item19.107 - A.L.s., from G. Polya, Zurich
- Item19.108 - A.L.s., from G. Polya, Stanford
- Item19.109 - A.L.s., from Hans Rademacher, Princeton
- Item19.110 - A.L.s., from Hans Rademacher, Philadelphia
- Item19.111 - A.L.s., from A. R. Richardson, Swansea
- 30 more...