Coal output (monthly statistics). Return (in part) to an order of the Honourable the House of Commons, dated 26th February, 1920;--for, return "relating to the output of coal at coal mines in the United Kingdom during periods of four weeks, commencing with the period ended the 21st day of June, 1919, and to the number of persons employed at the end of those periods, in the various districts. (In continuation of Parliamentary Paper no. 175 of session 1919.) [electronic resource].