- FondsMacMahon - Papers of Percy Alexander MacMahon
- SeriesB - Papers belonging to Sir Charles Moore Watson
- File2 - The Schoolgirl Problem
- Item1 - Cover sheet
- Item2 - Letter to Charles Watson
- Item3 - The Problem of the Eighteen Schoolgirls
- Item4 - Miscellaneous notes
- Item5 - The Problem of the Twenty-One Schoolgirls
- 6 more...