- FondsMordell - Papers of Louis Joel Mordell
- Series1-40 - Letters
- File12 - Hilbert
- Item12.1 - A.L.s., in German, from Gottingen
- Item12.2 - A.L.s., in German, from Gottingen
- Item12.3 - T.L.s., in German, from Gottingen
- Item12.4 - A.L.s., in German, from Gottingen
- Item12.5 - A.L.s., in German, from Zurich