United States. Bituminous Coal Division

• Manual of instructions for compiling reports on cost and production tonnage (cost form no. 4) for bituminous coal mines with an average daily productive capacity in excess of 50 tons and/or all mines shipping directly by rail or river regardless of daily
• Orders of the Bituminous Coal Division of the Department of the Interior ... No. 1-350, May 24, 1937 to March 25, 1943 ...