In Situ Tests of Bearing Capacity of Roof and Floor in Selected Bituminous Coal Mines by Robert E. Wood, David A. Larson, Manuel Gomez, Kathleen Hazen, Everett A. Sondreal, James H. Russell, Alexander May, Foster Fraas, Dennis V. D'Andrea, Hal J. Kelly, Alvin R. Howard, Anthony J. Barry, Albert Rhode, Robert E. Barieau, David E. Fogelson, William Jefferson Boone, George M. Potter, Benjamin I. Ferber, Bruce D. Sartwell, Clyde M. Frost, D'Arcy P. Banister, George W. Weems, Howard D. Jacobs, Parkman T. Brooks, Richard L. Fischer, Roger J. Morrell, Stephen D. Cramer, George Laurence Gates, Fred J. Brenenborg, Joseph W. Town, Oscar B. Nair, Paul B. Needham, Philip L. Cottingham, V. Anthony Cammarota, William E. Bruce, W. Hodge Caraway, Arlo D. Hendrickson, D. Danforth, David Schlain