Geologic Factors Causing Roof Instability and Methane Emission Problems

The Lower Kittanning Coalbed, Cambria County, Pa

by Ann G. Kim, Bruce T. Brady, Byron A. Baker, Charles M. McCulloch, Charles P. Lazzara, D. E. Siskind, David S. Burgess, Douglas D. Bolstad, Edward George Davis, Fred N. Kissell, H. E. Powell, James J. Olson, Laurence G. Trudell, Lung Cheng, Paul J. Barrett, W. F. Marshall, Walter W. Fisher, William Joseph Campbell, C. Kenneth Eilerts, David L. Neylan, Henry W. Roehler, Ignatz L. Feld, J. R. Alldredge, Joan C. Biordi, Leo W. Higley, Louise J. Douglas, Maurice Deul, Michael George Zabetakis, P. P. Zukovich, Paul Watson Johnson, R. W. Hurn, Rees D. Groves, Robert C. Steckley, Wilbur I. Duvall, Curtis H. Elder, Edwin W. Collins, Frank A. Peters, John F. Papp, John Ward Smith, M. Ashraf Mahtab · 1973