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• REFERENCES <br />1. 'Subsidence Engineers' Handbook': National Coal Board Mining <br />Department, 1975. <br />2. 'Subsidence Potential in Shale and Crystalline Rocks': Abel, J.F. and <br />Lee, F.T., U.S. Dept. of Interior, Open File Report 80-1072, 1980. <br />3. 'Research into the Determination of Pillar Size': Wilson, A.H. and <br />Ashwin, D.P., The Mining Engineer, June 1972. <br />4. 'Rock Mass Response to Mining Longwall Panel 4N, York Canyon Mine': <br />Gentry, D.W. and Abel, J.F., Mining Engineering, March 1978. <br />C J <br />• <br />Ex. 7-6 <br />