1. Proceedings of the 2nd Ash Utilization Symposium;Manz,1970
2. Paper presented at the 4th International Ash Utilization Symposium;Manz,1976
3. Paper presented at Low-Rank Coal Symposium;Manz,1989
4. Ash production and utilization in the world;Manz,1982
5. Supplementary Paper presented at ACI Conference on Fly Ash, Silica Fume, Slag and Natural Pozzolans in Concrete;Manz,1989