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<br />REFERENCES <br />West Elk Coal Company; Technical Revision to Permits-To-Mine <br />CMLRB C-007-80 and OSM CO-0021, Mt. Gunnison No. 1 Under- <br />ground Mine, Refuse Disposal Area, October 1984. <br />2. Miller, J. F., Frederick, R.H., and Tracey, R. J.; Precipita- <br />tion-Frequency Atlas of the Western United States, NOAA Atlas <br />2, Volume III-Colorado, U.S. Department of Commerce, 1973. <br />3. United States Department of Agriculture, Soil Conservation <br />Service., Technical Release No. 55, January 1975. <br />4. Rockaway, T. D., Stephenson, R.W.; Geotechnical Evaluation of <br />Coal Pillars in Underground Coal Mines, Bulletin of the <br />Association of Engineering Geologists, Volume XIX, Number 1, <br />February 1982. <br />i <br />5. Tillman, S. M.; Determination of Subcoal Strata Strength <br />Using Ultrasonic Testing, Bulletin of the Association of <br />Engineering Geologists, Volume XIX, Number 1, February 1982. <br />6. Chen, C.Y.; Engineering Properties of Coal Mine Refuse, The <br />First International Symposium on Stability in Coal Mining; <br />Vancouver, British Columbia, Canada. April 1978. <br />Backer, R. R.; Busch, R. A.; and Atkins, L. A.; Physical <br />Properties of Western Coal Waste Materials, United States <br />Department of the Interior, Bureau of Mines, Report of <br />Investigation 8216, 1977. <br />u <br />