- FondsMordell - Papers of Louis Joel Mordell
- Series1-40 - Letters
- File13 - Landau
- Item13.1 - A.P.s., in German, from Gottingen
- Item13.2 - A.L.s., in German from Jerusalem
- Item13.3 - A.P.s., in German, from Gottingen
- Item13.4 - A.P.s., from Berlin
- Item13.5 - A.L.s., in German, from Oberlayern
- Item13.6 - A.L.s., in German, from Berlin
- Item13.7 - A.L.s., in German
- Item13.8 - A.L.s. (not in EL's hand), from Copenhagen