Arnold Danvers Power's collection of publishers letters:
- Letters to Daldy, Ibister & Co., later Ibister & Co., to members of the firm, or to authors of works published to them 1876-1897.
- Letters addressed or forwarded or forwarded to A.D. Power, including letters about the Publishers' Association and Publishers' Circle 1899-1947.
- Letters to C.H. St. John Hornby 1918-1931.
- Two photographs dated 1876-1947 of Alfred Ernest Pitman (1862-1852), Governing Director of publishing house Sir Isaac Pitman & Sons Ltd.