- FondsMacMahon - Papers of Percy Alexander MacMahon
- SeriesB - Papers belonging to Sir Charles Moore Watson
- File2 - The Schoolgirl Problem
- 6 more...
- Item7 - Letter to Sir Charles Watson
- Item8 - The Problem of the Twenty-One Schoolgirls
- Item9 - Letter to Sir Charles Watson
- Item10 - Letter to Sir Charles Watson
- Item11 - Diagram of the 15-16 Puzzle