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 consists of Barnes' correspondence [Boxes 1-7] to/from a wide assortment of friends, colleagues and family members; notes and ephemera relating to her interest in the esoteric, primarily from the 1940s [Box 8]; notes, seating arrangements, invitation lists and correspondence relating to Barnes' organization of lectures by Claude Bragdon and P.D. Ouspensky [Box 9]; address books and social records from the mid to late 1940s during her marriage to Hamilton Fish Armstrong [Box 10]; biographical information, photographs, and financial documents [Box 11]; and research for, and drafts of, a majority of her writing [Boxes 12-16].

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.

The collection consists primarily of materials relating to "Shingleside," a country home in Charlotte, NY designed for Stein by Claude Bragdon, but it also includes several family photographs. In 1916, Nathan Stein's family commissioned Carl Raschen to make drawings of the house and grounds. Raschen (1882-1961) was a painter, illustrator, etcher and one-time teacher at the Chicago Art Institute whose work appeared in many newspapers and periodicals of the day. Plates were made from the drawings to illustrate a privately printed booklet; some of the copper plates are also in this collection.