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International Ash Utilization Symposium (3rd : 1973 : Pittsburgh): Ash utilization : proceedings: Third International Ash Utilization Symposium. Sponsored by National Coal Association, Edison Electric Institute, American Public Power Association, National Ash Association, and Bureau of Mines, Pittsburgh, Pa., March 13-14, 1973 (U.S. Dept. of the Interior, Bureau of Mines, 1974), also by John D. Spencer, William E. Eckard, John H. Faber, National Ash Association, American Public Power Association, Edison Electric Institute, and National Coal Association (page images at HathiTrust)
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