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L.R. Perino Page 17 _)ril 27, 1993 <br /> REFERENCES (Continued) <br /> Maier, M.M. , 1989, Plugging the Ben Butler and Tip Top Mine Adits, <br /> G&W Eagle Mine: Memo Dames & Moore, 3 p, Dec 8 <br /> Merritt, F.S. , 1983, Standard handbook for civil engineers: <br /> McGraw-Hill, 1578 p <br /> Morhard, R.C. , I. Chiappetta, R. Frank, D.G. Borg & V.A. Sterner, <br /> 1987, Explosives and rock blasting: Atlas Powder Co. , 662 p <br /> Obert, L. , W.I. Duvall & R.H. Merrill, 1960, Design of Underground <br /> Openings in Competent Rock, U. S. Bureau of Mines Bul 587, 36 <br /> P <br /> Obert, L. & W.I. Duvall, 1967, Rock mechanics and the design of <br /> structures in Rock: Wiley, 650 p <br /> Stock, M.D. & R. Walston, 1992, Preliminary characterization of the <br /> hydrology and water chemistry of the Sunnyside Mine and <br /> vicinity, San Juan County, Colorado: Simon Hydro-Search, 146 <br /> p, Feb 11 <br /> Stock, M.D. , R. Walston & C. Norris, 1993, Evaluation of hydraulic <br /> and hydrochemical aspects of proposed bulkheads, Sunnyside <br /> Mine, San Juan County, Colorado: Simon Hydro-Search, 154 p, <br /> Mar 12 <br /> Troxell, G.E. , H.E. Davis & J.W. Kelly, 1968, Composition and <br /> properties of concrete: 2nd ed, McGraw-Hill, 529 p <br /> World Mining, 1969, How West Driefontein gold mine fought and won <br /> the flood battle: U.S. ed, v 5, n 3, p 18-36, Mar <br />