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• <br />REFERENCES <br />Bray, J. W. and Hoek, E., Rock 51ope Engineering, Revised Third Edition, London: The <br />Institute of Mining and Metallurgy, 1981. pp. 23, 226-256 <br />Caterpillar Performance Hondbook, Edition II. Caterpillar Tractor Co., Peoria, <br />Illinois: 1980. <br />$ME Mining Engineering Handbook, Volume I. The American Institute of Mining, <br />Metallurgical, and Petroleum Engineers, Inc., Baltimore, Maryland: 1973. <br />• <br /> <br />Revised 3/82 <br />3.56-22 <br />