APA

U.S. Department of the Interior. Bureau of Mines Information Circular 8488, . (1970). Ash utilization. 2nd symposium, Pittsburg, March 10-11, 1970. Proceedings. Washington DC: U.S. Department of the Interior. Bureau of Mines Information Circular 8488.

Chicago

U.S. Department of the Interior. Bureau of Mines Information Circular 8488, . 1970. Ash utilization. 2nd symposium, Pittsburg, March 10-11, 1970. Proceedings. Washington DC: U.S. Department of the Interior. Bureau of Mines Information Circular 8488.

Harvard

U.S. Department of the Interior. Bureau of Mines Information Circular 8488, . (1970). Ash utilization. 2nd symposium, Pittsburg, March 10-11, 1970. Proceedings. Washington DC: U.S. Department of the Interior. Bureau of Mines Information Circular 8488.

MLA

U.S. Department of the Interior. Bureau of Mines Information Circular 8488, . Ash utilization. 2nd symposium, Pittsburg, March 10-11, 1970. Proceedings. Washington DC: U.S. Department of the Interior. Bureau of Mines Information Circular 8488. 1970.