The collection consists of letters to Cecil primarily concerning the writing and publication of books about the Trollopes. Included are letters by N. John Hall, Helen Heineman, author of Mrs. Trollope: The Triumphant Feminine in the Nineteenth Century (1978), Katharine M. Longley, Claire Tomalin, author of The Invisible Woman, the Story of Nelly Turner and Charles Dickens (1990), Herbert Van Thal, Harold Acton, and Lloyds Bank concerning the estate (1954) of M. R. Trollope. Also present are a small file of correspondence (1946-1947) of Cecil's mother, Beatrice Cecil, with Roger Senhouse, Michael Sadleir, and Bradford Booth, concerning her objections to parts of the book The Trollopes (1945), by L. & R. P. Stebbins, and photostats of the wills of Frances Eleanor Trollope and T. Adolphus Trollope.