This collection consists of correspondence, manuscripts and miscellaneous materials. The correspondence, covering the years 1885-1929, contains over 200 letters to Tynan. Correspondents include members of the Yeats family, Lady Wilde, Wilfrid Blunt, Douglas Hyde, Padraic Colum, Jane Barlow, T.M. Healy, Edith OE. Somerville, Alice Milligan, Lennox Robinson, Sir Horace Plunkett, Lady Gregory, and George Russell, among others. Also present are several letters to her daughter Pamela Hinkson.

The manuscripts collected include twenty-five handwritten, typed, or printed articles on literary topics and personalities such as "The Anglo-Irish," "The Descendants of an Irish Patriot," and "English Women Poets." Also available are the manuscripts of her reminiscences: "Twenty-Five Years," "The Middle Years," and "Years of the Shadow." There are clippings of various articles written about her by John O'Leary in 1892, A. P. Graves in 1884, and W.B. Yeats, as well as clippings of articles she wrote about Lionel Johnson, Susan Mitchell, and Francis Thompson.

In the miscellaneous materials, there are programs for the Dublin University Tercentenary service in 1891, stock certificates, election petitions, booklets written by other writers, menus, invitations, and souvenirs. Included here are her Parnell souvenirs, among them the telegram she received announcing Parnell's death. This large collection is extensive and offers the researcher insight into Tynan's creative process as well as her life. There are also copies of most of her printed books.