Progress Report

Experiments on Strength of Small Pillars of Coal in the Pittsburgh Bed

by Albert Louis Toenges, Charles B. Carpenter, Charles Freeman Jackson, Earl Carlton Lane, Ernest L. Garton, F. G. Miller, George William Jones, Harold Putnam Greenwald, John Roy Thoenen, John S. Ball, Joseph Edgar Tiffany, Julius Bruce Clemmer, Lee Clyde Ilsley, Martin Anderson Elliott, Oliver Caldwell Ralston, Reginald Scott Dean, Roy Llewellyn Grant, S. J. Broderick, S. M. Shelton, Vernon Frank Parry, William McKinley Deaton, William Parks Yant, William Waugh Adams, A. B. Coates, A. George Stern, Alva Britt Hooker, Ballard H. Clemmons, Ernest Francis Buchard, Frank A. Jones, Henry C. Howarth, Irving Hartmann, John B. Goodman, M. M. Fine, Robert E. Kennedy, T. D. Lawrence, Z. C. Gaugler, G. J. Thomas, George Stanley Scott, R. H. Stacy · 1941