Papers of Henry Robertson, comprising personal and estate papers, 1829-1907; records of a very large number of Welsh railway undertakings, 1786-1911, comprising books of reference, surveryors' notebooks, acts of parlimaent, bills and estimates, conveyances and other title deeds, specifications and tenders, prospectuses and miscellaneous papers; office papers, correspondence and miscellaneous professional papers, 1824-1903; papers relating to several clubs and societies, 1888-1907; and printed books and papers, 1786-[c.late 19th cent.].