Papers of Seymour Montefiore Robert Rosso de Ricci (1881-1942) comprising: Volume of letters from various correspondents and notes concerning the compilation of de Ricci's Bibliotecha Britannica Manuscripta, a proposed comprehensive work on manuscript material in Great Britain, which was never completed, 1934-1955; thirty-four boxes containing over 64,000 index cards giving bibliographic references to archive and manuscript collections in the United Kingdom, listed alphabetically by town, institution and/or college, along with cards giving details of manuscripts held by collectors and dated sales, arranged alphabetically and chronologically.

Papers relating to Imperial College archives, 1933-1987, notably Records Committee reports and correspondence, 1936-1938; correspondence relating to the muniment room, 1936-1957; donations, 1952-1980; purchase of the T H Huxley papers, 1933-1961, 1987.