- Frank Edward Byrne, Fred Forrest Lawrence, Geological Survey (U.S.). Champaign District, Geological Survey (U.S.). Water Resources Division. Austin District, Geological Survey (U.S.). Water Resources Division. Tacoma District, Gerald Arthur FitzGerald, Guy Clarke Stevens, Guy Earl Harbeck, Harold Coble Troxell, Jack Bennett Graham, John G. Connor, Walter Basil Langbein, Clayton Haines Hardison, Wendell B. Johnson, Denzil W. Bergman
· 1949
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Frank Edward Byrne, Geological Survey (U.S.), Geological Survey (U.S.). Water Resources Division. Atlanta District, Geological Survey (U.S.). Water Resources Division. Austin District, Geological Survey (U.S.). Water Resources Division. Oklahoma City District, Geological Survey (U.S.). Water Resources Division. Portland District, Geological Survey (U.S.). Water Resources Division. Salt Lake City District, Geological Survey (U.S.). Water Resources Division. St. Paul District, Geological Survey (U.S.). Water Resources Division. Tacoma District, John Xavier Combo, Robert Thomas Littleton, Rollin E. Stevens, Roy Edwin Oltman, Ruth A. Atherton, Stanley E. Good, Walter Basil Langbein, Hubert William Lakin· 1949