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• <br />Literature <br />1. Rratzsch, H., 1983, Mining Subsidence Engineering, <br />Sprirger-verlag, Berlin Heidelberg New York, p. 593 <br />2. NCB: Subsidence Engineer's Handbook, 1975, <br />National Coal Board, <br />Mining Department, London, p.111 <br />3. Garc~er, S. D., 1974, Geology and Coal Reserves <br />of the Harvey Gap Area and Vicinity, Techn. Report <br />for Mrs. N. Eldridge of E1 Centro, California, p. 12 <br />U <br />4. Collins, B.A., 1976, Coal Deposits of the Carboru3ale, <br />Grand Hogback, and Southern Danforth Hills Coal Fields, <br />Eastern Piceanoe Basin, Colorado, Quarterly of the <br />Colorado School of Mines, Vol. 71, No. 1, January, p.135 <br />5. Zilavy, B., 1968, Subsidence Influence on Surface, <br />(in Slovak), ALFA Publishers, Bratis]ava, Czechoslovakia, <br />PP• 276 <br />3b <br />• <br />