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Wardell, K. and Partners: Guidelines for Mining near <br />Surface 6Jaters. Phase II - Rept. for Bureau of Mines <br />Contract No. H0252021, 37 p., Feb., 1976 <br />Wardell, K. and Partners: Guidelines for Mining near <br />Surface Waters: Phase III - Rept. for Bureau of Mines <br />Contract No. 110252021, 50 p., May, 1976 <br />Wardell, K.: The Effects of Mineral and Other Underground <br />Excavations on the Overlying Ground Surface. <br />Proceedings of the Symposium on Geological and <br />Geographical Problems of Areas of High Population <br />Density, Washington, D.C., pp. 201-217, 1970 <br />Whittaker, B.N., R.H. Singh, and C.J. Neate: Investigation <br />and Evaluation Studies of Surface aid Subsurface <br />Drainage Pattern Changes Resulting from Longwall Mining <br />Subsidence. First International Mine Drainage <br />Symposium, Aenver, Colorado, May 20-23, 1979 <br />Williamson, W.H.: Hydrogeological Aspects of Coal Mining <br />Under Stored Waters near Sydney, Australia. SIAM OS - <br />78, Granada, Spain, pp. 309-328, 1978 <br />Wilson, A.H.: Research into the Determination of Pillar <br />• Size, Part 1, An Hypothesis Concerning Pillar <br />Stability. The Mining Engineer, Vol. 131, No. 191, <br />1972. <br /> <br />- G1 - <br />