- FondsMordell - Papers of Louis Joel Mordell
- Series1-40 - Letters
- File6 - Erdos
- File6.1 - Letters
- 28 more...
- Item6.1.29 - A.P.s., from Zistelalpe
- Item6.1.30 - A.P.s., from Budapest
- Item6.1.31 - A.L.s., from Princeton
- Item6.1.32 - A.L.s., from Princeton
- Item6.1.33 - A.L.s.
- Item6.1.34 - A.L.s., from Stanford University
- 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.
- 15 more...