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REFERENCES CITED <br />Wilson, A. H., 1972, An hypothesis concerning pillar stability, <br />The Mining Engineer, No. 141, v. 131, June 1972, p. 409-417. <br />Wilson, A. H., 1977, The effect of yield zones on the control of <br />ground, Sixth International Strata Control Conference, September <br />1977, Banff, Canada <br />Wilson, A. H., 1981, Thesis, University of Nottingham, "The <br />Stability of Underground Workings in the Soft Rocks of the Coal <br />Measures" <br />Wilson, A. H., 1982a, A new approach to the design of multi-entry <br />developments for retreat longwall mining, in Proceedings Second <br />Conference on Ground Control in Mining, S. S. Peng and J. H. <br />Kelley, ed. Dept of Mining Engineering, college of Mineral and <br />Energy Resources, West Virginia University, Morgantown, West <br />virginia, July 1982. <br />Wilson, A. H., 1982b, Pillar stability in longwall mining in <br />Chapter 9, State-of-the-Art of Ground Control in Longwall Mining <br />and Mining Subsidence, Y. P. Chugh and M. Karmis, ed., SME of <br />AIME, New York, New York, 1982. <br />• <br /> <br />Cyprus Orchartl Valley Mine March 12, 1992 <br />Panel C Pillar Analysis page 7 <br />