- FondsMordell - Papers of Louis Joel Mordell
- Series1-40 - Letters
- File26 - Schur
- Item26.1 - A.L.s., in German, from Berlin
- Item26.2 - A.L.s., in German, from Berlin
- Item26.3 - A.L.s., in German, from Spiez am Thunen See
- Item26.4 - A.L.s., in German, from Berlin
- Item26.5 - A.L.s., in German, from Berlin