Carbonizing Properties of Butler County, Pa., Coals

by A. A. Berk, A. C. Rice, Arthur F. Colombo, C. S. Tout, Carl J. Chindgren, Donald William Scott, Eben L. Singleton, G. W. Elger, Gene Asai, George W. Birge, Gerald V. Gibbs, John Ward Smith, Karl Clyde Dean, Mark I. Copeland, Ralph V. Higgins, Thomas T. Campbell, Vernal E. Edlund, Wesley T. Holmes, William Harlan Ode, Lloyd Harold Banning, Alan J. Leighton, C. A. Stone, David E. Wolfson, Donald W. Frommer, Francis Harold Gibson, G. L. Hopps, Irving L. Turner, Ivan L. Nichols, J. P. McCullough, L. Carpenter, Lester C. Bauerle, R. S. Lang, W. Floyd Holbrook, F. Donald Bloss, Joe B. Rosenbaum, Raynard V. Lundquist