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Subsidence Evaluation For <br />Exhibit 60 The Apache Rocks And The Box Canyon Mining Areas Page 28 <br />• REFERENCES <br />Beaz, William A. 1972. Personal Communication with C. R. Dunrud. <br />DeGraff, J. V. and C. H. Romesburg. 1981. "Subsidence Crack Closure; Rate, Magnitude, and <br />Sequence." International Association ojEngineering Geology Bulletin 23. <br />Dunrud, C. R. 1987. Subsidence - An /mportant Aspect of Land Use Planning Above <br />Abandoned Underground Coal Mines. Association of Engineering Geologists Symposium <br />Series, No. 4. <br />Dunrud, C. R. and F. W. Osterwald. 1980. Effects ojCool Mine Subsidence in the Sheridan, <br />Wyoming Area. U.S. Geological Survey Professional Paper 1164. <br />Dunrud, C. R. 1976. Some Engineering Geologic Factors Controlling Coal Aline Subsidence in <br />Utah and Colorado. U.S. Geological Survey Professional Paper 969. <br />Gentry, D. W. and J. F. Abel, Jr. 1978. "Surface Response to Longwall Coal Mining in <br />Mountainous Terrain." Associa[ion of Engineering Geologists Bulletin I~olume /5, No. 2. <br />Liu, T. Q. 1981. Surface Afovements (herburden Failure and its Application. Co, China: Coal <br />• Industry Publishing. (in Chinese). <br />National Coal Board. 1975. S:~bsidence Engineers' Handbook. National Coal Board, United <br />Kingdom, Mining Department. <br />Peng, Syd S. 1992. Surface Subsidence Engineering. Society for Mining, Metallurgy, and <br />Exploration, Inc. <br />Peng, Syd S. and S.M. Hsuing. 1986. "Guidelines for Subsidence Abatement over Abandoned <br />Mined Land." Annual Report (July 1, 1985 -June 30, 1986). Submitted to West Virginia <br />Department of Energy. <br />• <br />Peng, Syd S. and D.Y. Geng. 1982. "Methods of Predicting the Subsidence Factors, Angle of <br />Draw and Angle of Critical Deformation." Proceedings of State-of--the-Art of Ground <br />Control in Longwall Mining and A~/ining Subsidence Conference. Littleton, Colorado. <br />C:\971-032\181ard\Exhibit 60.doc <br />831-032.181 Wright Water Engineers, Inc. <br />