Butterley Company correspondence file on the extension of the lease of coal for the Mundy and Charlton minerals under lands at Heanor, Loscoe, Langley and Shipley Involving the Shipley Collieries Limited, with the making of one lease covering all Mundy and Charlton minerals previously leased separately. Including schedule of leases (1912-1936), loose draft lease, 1939, and loose plans (6) of areas leased around New Langley Colliery, including one plan also covering Bailey Brook and Ormonde collieries May 1938-Apr 1940