- Cleveland Bridge & Engineering Co Ltd, Darlington: site diaries, photographs and slides rel to the Bosphorus Bridge project 1971-1973 (1508)
- Marple, Ridgeway & Partners Ltd, civil engineering contractors, London: records incl photographs, mainly rel to construction work at Port Talbot, the Hammersmith flyover and the Chiswick viaduct 1960-1970 (1510)
- John Mowlem & Co plc, builders and civil engineers, Brentford: records incl minute books, ledger book, contracts and specifications and corresp 1838-1976 (1552)
- David Rowell & Co Ltd, iron, steel and wire fencing manufacturers and ventiliating engineers, London: corresp, bridge details, stress diagrams and costs of bridges 1919-1960 (1503)
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Institution of Civil Engineers