Collection includes Bertha Coolidge Slade's collection of Edgeworth materials, including correspondence between Edgeworth and Richard Bentley and others; copies of letters by Edgeworth, including correspondence with Rachel Mordacai Lazarus and John Murray; letters by Richard Lovell Edgeworth; holograph poem entitled "Enigma"; drawing of Edgeworth's Library by F. W. Fairholt; and Slade's research files, gathered during research for her book, "Maria Edgeworth, 1767-1849, a Bibliographical Tribute," which consist of correspondence with rare book and manuscript dealers including Michael Sadleir, and notes about various editions of Edgeworth's writings. Also included is original Edgeworth material from other sources, including correspondence with Anna Letitia Barbauld and others; letters by Richard Lovell Edgeworth; several engravings of Edgeworth; and an undated corrected typescript by E. G. Ewens entitled "Maria Edgeworth: A Study."