- FondsMordell - Papers of Louis Joel Mordell
- Series1-40 - Letters
- File6 - Erdos
- File6.1 - Letters
- 34 more...
- Item6.1.35 - A.L.s., from Stanford University
- Item6.1.36 - A.L.s., from University of Pennsylvania
- Item6.1.37 - A.L.s.
- Item6.1.38 - A.L.s.
- Item6.1.39 - A.L.s.
- Item6.1.40 - A.L.s.
- Item6.1.41 - A.L.s.
- Item6.1.42 - A.L.s., from University of Pennsylvania
- Item6.1.43 - A.L.s., from University of Pennsylvania
- 9 more...