Alfred Copeland Callen, Alonzo Plumsted Kratz, Carl Herbert Casberg, Cullen Warner Parmelee, Donald Babcock Keyes, Frank Erwin Richart, George Wellington Pickels, Sherlock Swann, Wilbur M. Wilson, Carl Edward Schubert, Charles Overton Harris, Cloyde Moffett Smith, Robert Dewey Snow, Thomas Newkirk McVay, Vernon Peter Jensen, James Mather · 1931
Carl Herbert Casberg, Cloyde Moffett Smith, Frederick Guy Straub, Hardy Cross, Harold Eaton Babbitt, Wilbur M. Wilson, William Ray Morgan, Benn J. Leland, Carl Edward Schubert, David Ray Mitchell, Rex Lenoi Brown, Fenner H. Whitley · 1935