Correspondence (1892-1960); diaries, genealogical materials, notebooks, photographs, printed material, including articles and clippings, scrapbooks, memorabilia, and sketchbooks. Correspondence includes that of Adelaide Cole Chase, Clara Carter Hyatt Coad, Anna Hyatt and Archer M. Huntington, Audella Hyatt, and Alfred G. Mayor.

Correspondence, incoming and outgoing; certificates; contracts; family trees; notebooks; notes, books; magazines; and pamphlets. Material pulled from the papers of various members of the Hyatt and Mayor families, especially those of Audella Hyatt and Harriet Hyatt Mayor.