Records relating mainly to the industrial concerns of the Crawshay family of Cyfarthfa, Merthyr Tydfil, Glamorgan, [1706]-1878, including leters and letter books of William Crawshay I and II and Robert Crawshay, 1806-1877; cash books, ledgers and bankers drafts, 1834-1888; deeds, [1706]-1885; wills, deeds and miscellaneous material, 1801-1838; balance sheets for ironworks, 1810-1867; will, valuation and probate for William Crawshay II, 1865-1869; shares and bills of exchange, 1870-1878; and Hilston Park estate papers, 1838-1862 and Caversham Park estate papers, 1826-1864. The archive represents the working papers of a major ironworking dynasty.

Papers of Leonard Eliot Crawshay-Williams, mainly correspondence, 1865-1957, including general literary correspondence, [1907]-1957; literary press cuttings, 1907-1939; notes for speeches, 1904-1945; press cuttings, 1888-1947; financial and administrative papers, 1902-1945; family papers, 1865-1951; insurance policies, 1900-1944; papers relating to Canadian interests, 1902-1954; family correspondence, 1872-1936; and correspondence between Eliot Crawshay-Williams and women friends, [n. d.].