911. ---------------.[FIELDNER, A. C.] Recent Developments in Coal Preparation and Utilization. Bureau of Mines Minerals Yearbook, 1937, pp. 935-954; Fuel, vol. 17, 1938, pp. 272-280, 300-307; Chem. Abs., vol. 31, 1937, p. 8062.

911. ---------------. [FIELDNER, A. C.] Recent Developments in Coal Preparation and Utilization. Bureau of Mines Minerals Yearbook, 1937, pp. 935-954; Fuel, vol. 17, 1938, pp. 272-280, 300-307; Chem. Abs., vol. 31, 1937, p. 8062.

Review with extensive bibliography.