- 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 1 - Letters relating to historians A-L
- File13 - Letters from G. L. Burr
- Item1 - Autograph letter, signed, to the editors of the Cambridge Medieval History from G. L. Burr, New York
- Item2 - Autograph letter, signed, to R. J. Tanner from G. L. Burr, New York
- Item3 - Autograph letter, signed, to R. J. Tanner from G. L. Burr, New York