- 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
- Arthur Maine Piper, Betsy A. Weld, C. S. Conover, Ernest LeRoy Hendricks, Everett V. Richardson, Frank Newell Visher, Fred Kunkel, Harold Edgar Thomas, Harry George Rodis, James Kincheon Searcy, James Trumbull, John Augustus Baker, Kenneth Allen MacKichan, Kenneth H. Fowler, Malcolm D. Hale, Philip Elmer LaMoreaux, Robert Evans Steacy, Samuel Wilson West, Stanley Alfred Schumm, Walton Henry Durum, D. B. Simons, Erwin S. Asselstine, John Craig Kammerer, John Francis Mink, Joseph Haffty, Richard Earl Hoggatt, Richard Frederick Hadley, William Kam, Arthur Johnson, G. J. Posakony, James E. Bowie
· 1949