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2. An attempt to use D.T.A. on argillaceous Coal Measures rocks;Ashwin;M.R.E. Technical Memorandum, 62,1960
3. The compressive strength of Coal Measure rocks;Price;Colliery Engng,1960
4. The strength of Coal Measure rocks in triaxial compression;Price;N.C.B.M.R.E. 2159,1960