- Charles D. Owens, Clarence Floyd Winchester, Clinton Woodward Phillips, Dwight R. Smith, Olman Hee, Orus L. Bennett, Robert Harold Miller, Ronald Walter Penney, United States. Agricultural Research Service. Soil and Water Conservation Research Division, V. C. Jamison, Dwight David Smith, John F. Thornton
· 1967
- Phillip Luginbill, Allan K. Stoner, Byron Thomas Shaw, Charles S. Creighton, Charles Scott Shaw, Douglas Everett Bryan, Franklin W. Martin, George W. French, Gino J. Mangialardi, J. S. Palmer, J. Wendell Snow, Jerry Okey Newman, Marvin Howard Brunson, Orin Aneil Hills, Pat O. Currie, Perry A. Glick, Raymond Patana, Dwight R. Smith, Oliver L. McCaskill
· 1969