- FondsMordell - Papers of Louis Joel Mordell
- Series1-40 - Letters
- File9 - Hasse
- 13 more...
- 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
- Item9.18 - T.L., from Marburg
- Item9.19 - A.P.s.
- Item9.20 - T.L.s., from Gottingen
- Item9.21 - Typed copy of letter from HH to Stone
- Item9.22 - A.L.s., from Ahrensburg