- FondsMordell - Papers of Louis Joel Mordell
- Series1-40 - Letters
- File9 - Hasse
- 8 more...
- Item9.9 - A.L.s., from Marburg
- Item9.10 - A.P.s., from Nikolausberg
- Item9.11 - T.L.s., from Marburg
- Item9.12 - T.L.s., from Marburg
- Item9.13 - Fragment of T.L., from Marburg
- Item9.14 - A.L.s., from Marburg
- Item9.15 - T.L.s., from Marburg
- Item9.16 - T.L.s., from Marburg
- Item9.17 - A.P.s., from Kassel
- 5 more...