Edwin Wallace Lohr, Garland Bayard Gott, Geological Survey (U.S.), Jack Edward Harrison, James David Vine, James Kincheon Searcy, L. E. Smith, Morris Mordecai Thompson, Richard Carlton Culler, Robert Ugstad King, Walter Scott West, William Edward Barnes Benson, Benjamin Franklin Leonard, Harold V. Peterson, Max Gregg White, Ralph Leroy Erickson · 1949
Aaron Clement Waters, Edwin Wallace Lohr, Garland Bayard Gott, Geological Survey (U.S.), Jack Edward Harrison, James David Vine, James Kincheon Searcy, L. E. Smith, Michael Fleischer, Morris Mordecai Thompson, Richard Carlton Culler, Robert Ugstad King, Walter Scott West, William Edward Barnes Benson, Benjamin Franklin Leonard, Harold V. Peterson, Harry Clifford Granger, Max Gregg White, Ralph Leroy Erickson · 1952
C. F. Dyer, Charles T. Snyder, Donald George Metzger, Ellis Davis Gordon, F. W. Kennon, Fred Kunkel, Harold V. Peterson, Ira Wendell Marine, Norman Julius King, Oliver J. Cosner, Phillip W. Johnson, Reuben Clair Newcomb, Richard Frederick Hadley, Robert Edward Evenson, Robert Vittum Cushman, Richard Allen McCullough, Robert Albert Krieger, Edwin P. Weeks, John A. McCabe · 1961