- FondsMordell - Papers of Louis Joel Mordell
- Series1-40 - Letters
- File2 - Baer
- Item2.1 - A.L.s., from Innsbruck
- Item2.2 - A.L.s., from Innsbruck
- Item2.3 - A.L.s., from Belgium
- Item2.4 - A.L.s., from Patterdale
- Item2.5 - A.L.s., from Patterdale
- Item2.6 - T.L.s., from Colorado
- Item2.7 - T.L.s., from Urbana, Illinois