Papers mainly concerning the construction and administration of bridges, roads, piers, railways, harbours, reservoirs and canals in Scotland, 1782-1841, including correspondence of Henry Dundas, 1st Viscount Melville (1742-1811), Robert Saunders Dundas, 2nd Viscount Melville (1771-1851), and Sir Thomas Dundas, 1st Baron Dundas (1741-1820). The collection comprises letters, petitions, memorials, plans, estimates, reports, financial accounts, legal papers, trustees minutes and circulars relating to bridges including the Dee, Don, Urie, Findhorn, Montrose, Nairn, Pease, and Spey; canals including the Borrowstone Canal Navigation, the Clarence Canal, the Forth and Clyde Navigation, and the Union Canal (Falkirk to Edinburgh); ferries such as the Dysart Ferry, Queensferry, and Tay Ferries; harbours and piers notably Burntisland Harbour and Pier, Kinghorn Harbour, Hartlepool Pier, and Newhaven Pier; the Gala Water Railroad; the North Esk Reservoirs; roads in Aberdeen, Inverness, Dalkeith, Edinburgh, Glenlaidnaig, Glenlichorn, Lanarkshire, Lauriston, Perth, and Stirling.

Papers and consultancy reports, 1961-1976, mainly relating to dams and disasters, including reports on the Tannur dam, Jordan, the Roxo dam, Portugal, and the proposed dam at Scammonden, Yorkshire; report on the Clarkston disaster, Glasgow, of 21 October 1971; numerous photographs of the Aberfan disaster, Glamorgan, 1966. Obituary of Nash in Quaker Work, 1985.

Financial records of the Staines Reservoir Joint Committee, including half-yearly accounts; journal; cash book; ledgers; register of wills and papers relating to payments to solicitors.

Corporate records of the Staines Reservoir Joint Committee, including Committee meeting attendance books, proceedings books and minutes; legal papers relating to property, rating, water supply, stocks and shares, Parliamentary issues and contracts; correspondence and debenture stock volumes.

Records of the Staines Reservoir Joint Committee, comprising progress reports from the Engineer.