1. Providing a solution;Hansen,1972
2. Summarized in: “Use of waste materials in the construction industry. Analysis of the RILEM Symposium by Correspondence”,1979
3. Waste materials as potential replacements for highway aggregates;Miller,1976
4. Utilization of coal refuse for highway base of subbase material;Maneval,1974
5. Mineral waste utilization studies;Collings,1974