- CollectionCamb. Medieval History - Papers relating to the Cambridge Medieval History Series
- SeriesBox 1-2 - Letters to and from contributing historians to Cambridge Medieval History
- SubseriesBox 2 - Letters relating to historians M-W
- File63 - Letters from Ch. Petit Dutaillis
- Item1 - Autograph letter, signed, to 'Monsieur le Professeur', from Ch. Petit Dutaillis, Paris
- Item2 - Autograph letter, signed, to 'Cher Monsieur', from Ch. Petit Dutaillis, Paris