1. U. S. Dept. of Commerce, “Statistical Abstract of the United States”, 101st ed., 1980, p. 771.
2. Statistics Canada, “Canada’s Mineral Production —Preliminary Estimates”, Catalog 26-202, 1980.
3. R. S. Boynton:Chemistry and Technology of Lime and Limestone, 2nd ed., John Wiley and Sons Inc., New York, NY, 1980.
4. F. Schwarzkopf: “Lime Burning Technology”, Kennedy Van Saun Corp., Danville, PA, 1974.
5. J. K. Brimacombe and A. P. Watkinson:Metall. Trans. B, 1978, vol. 9B, pp. 201–02.