by Charles Lee McGuinness, David A. Rickert, Edward Malcolm MacKevett, Geological Survey (U.S.), George William Moore, Harold Edgar Thomas, Harold P. Guy, James E. Elliott, John Henry Feth, John Richard Sheaffer, John Stevens Schlee, Linda J. Britton, Paul Kellogg Theobald, Robert Sprague Jones, Saul Edward Rantz, William Joseph Schneider, Andrew Maute Spieker, Charles Emmet Thompson, Davis W. Ellis, Eli A. Silver, James E. Goddard, James G. Smith, John David Wells, R. C. Averett, R. F. Ferreira

1949