- FondsMordell - Papers of Louis Joel Mordell
- Series1-40 - Letters
- File3 - Chapman
- Item3.1 - Fragment of A.L.s., from Imperial College of Science and Technology, London
- Item3.2 - T.L.s., from Imperial College of Science and Technology, London
- Item3.3 - A.L.s., from Brussels
- Item3.4 - A.L.s., from Imperial College of Science and Technology, London
- Item3.5 - A.L.s., from London
- Item3.6 - A.L.s., from London
- Item3.7 - A.L.s., from Manchester