by Albert Ernest Roberts Westman, Frank Erwin Richart, Harold Eaton Babbitt, Richard Ernest Gould, Samuel Wilson Parr, University of Illinois at Urbana-Champaign. Engineering Experiment Station, Wilbur M. Wilson, Anton Brandtzæg, Marion I. Levy, Rex Lenoi Brown

1928

by University of Illinois (Urbana-Champaign campus). Engineering Experiment Station, Albert Ernest Roberts Westman, Andrew Irving Andrews, Fred B. Seely, Hardy Cross, Harold Eaton Babbitt, Herbert Fisher Moore, Joseph Albert Polson, University of Illinois at Urbana-Champaign. Engineering Experiment Station, Harry Edward Schlenz, Richard Vernon James, Seichi Konzo, Tibor Ver

1930