Correspondence, circulars, statistics and printed items. Subjects include the grouping of collieries and the classification of coal, 1930-1943; proposed schemes for the regulation of the house coal trade in the counties of Glamorgan, Cardigan, Brecon, Carmarthen, Pembroke, Monmouth and Radnor, 1939; opinions and reports of W.H.F. Barklam, solicitor to the South Wales District (Coal Mines) Scheme; miscellaneous documents concerning the regulation and control of output, 1934-1936; circulars and reports regarding local collaboration between colliery and railway staffs and lists of marshalling yards, stations and depots, 1941; and notices and reports of Trade Committee meetings, 1940. Printed material includes a copy of the South Wales District (Coal Mines) Scheme, 1930, including amendments up to 1936; rules of the pension fund of the Scheme's Executive Board, 1940; district scheme for the production, supply and sale of coal in the South Wales District, 1930; list of owners participating in the Scheme, c.1932.