AirplanesAnthracite Mechanical Mining InvestigationsAbraham L. Engel, Avery H. Reed, C. E. Wyndham, Clayton A. Landsidle, E. P. Carman, Edward Roberts, Franklin A. Rutledge, John B. Gayle, Joseph A. Sutton, Oscar Carl Blade, Peter H. Toepfer, Robert W. Smith, Rollien Raymond Wells, Wesley A. Grosh, H. Stuart Auvil, James W. Pennington, John C. Hartley, John Manton, Robert L. Thorne, John Willard Buch, Paul A. Wasson, Stuart Robert Brinkley
