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- -44- <br />~ -. <br />REFERENCES <br />.~ <br />._ Abel, JF., Jr. and Lee, F.T., 1980, Lithologic controls on subsidence : SME AIME <br />- Preprint No. 80-314, p 16 <br />Bieniawski, Z.T., f968, The effects of specimen size on compression strength of coal <br />Intl. Jour. Rock Mech. ~ Min. Sci., pp. 325-340 <br />Bieniawski, LT. and Van Heerden, WJ_., 1975, The significance of in situ tests an <br />' ; large scale rock specimens Intl. Jour. Rock Mech. ~ Min. Sci., pp 101-I13 <br />Natimal Coal Board, 1975, Subsidence Engineers Handbook: London, National Coal <br />Board, p III <br />Wardell, K. and Eynon, P., 1968, Structural concept of strata control and mine design: <br />Inst. of Min. E. Met. Trans., Sec. A, Min. Ind., v. 77, pp A125-A150 <br />i I~ <br />L' <br />1: <br />I r - <br />4r' <br />Lv <br />Ir. <br />. I _ <br />I" <br />1 <br />t_ <br />~._ <br />1 .. <br />I. <br />