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<br />REFERENCES CITED <br />Abel, J.F., Jr., and Lee, F.T., 1980, Lithologic controls on subsidence: <br />Society of Mining Engineers of AIME Fall Convention, <br />Minneapolis, Minnesota, 1980, preprint BO-314. <br />Kapp. W.A., 1974, A study and evaluation of the elements of surfac! <br />subsidence observed at Kemira Colliery, New South Males: <br />(M.E. Thesis) Sydney, University of Sydney. <br />King, R.P, 1980, Evaluation of surface subsidence and horizontal strains <br />at York Canyon Mine, New Mexico: (M. S. Thesis) Colorado <br />School of Mines, Golden, Colorado. <br />Kripakov, N.P., 1981, Finite element analysis of yield-pillar stability: <br />Computers and Structures, V. 13, P. 575-593. <br />National Coal Board. 1975. Subsidence Engineering Handbook: National Coat <br />Board Mining Department, London, Great Britain, 1975. <br />Woodruff, S.D., 1966, Methods of working coal and metal mines, V. 2: New <br />York, Pergamon Press. <br />i <br />- ;.. ,_ <br />c ::.' ~! <br />' .-~.t1 : ~ ~ ..: Y~l. <br />ZK.:~ !'~. .'.i. ' <br />T <br />~ ;. <br />{~' 1 <br />• <br />32 <br />