1. Birmingham University Business Records: Cannock Chase Colliery Company archive, Minutes 1859–1929, 14/ii/1–19
2. Durham Record Office: NCB 2/277 and, D/Lo/B/219 Colliery viewers' valuations.
3. National Archives, Kew, London: BT 31 38683/6779 Defunct companies files. Yorkshire & Derbyshire Coal and Iron Co. Ltd./Carlton Main Colliery Co. Ltd
4. Northumberland Record Office, Gosforth Park, Newcastle: NRO 725, B3-19 Armstrong business articles, Reports Books, 1857–96.
5. Stock Exchange Archive, London Guildhall Library: Coal and Iron 1881–1914. MS 18000 Applications for listing