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.

Correspondence, personal documents, and published material. Correspondence includes that of Audella Hyatt, Alfred G. Mayor, and Harriet Hyatt Mayor.