This collection is an addition to the Bragdon Family Papers (call number A.B81). While the bulk of the original collection focuses on the life and work of Claude Fayette Bragdon, the majority of the Addition relates to his family members. Included are materials on Claude F. Bragdon, Charlotte (Wilkinson) Bragdon and the Wilkinson Family, Eugenie (Julier) Macaulay Bragdon, Henry Wilkinson Bragdon, Chandler Bragdon, May Bragdon, George Chandler Bragdon, George L. Bragdon, Katherine Elmina (Shipherd) Bragdon, and the Shipherd Family. The Addition contains family scrapbooks, diaries, correspondence and photographs.

The collection includes sixty-six letters from John Masefield, several photographs, sketches and memorabilia; twenty-one letters from Sir John C. Squire; twelve letters from Paul Horgan; eight letters from Claude Bragdon and others from such people as Sir Hamilton Harty, Dame Myra Hess and Hugh Walpole.