by Albert Watts Moore, Carl F. Dunker, Charles D. Converse, Claron Owens Hesse, Elmer Snyder, Everett Eugene Lund, Frank Custer Edminster, Franklin Elmer Allison, Franklin Jacob Crider, George Haymaker Vansell, Guy Weston Bohn, H. O. Hetzer, Harry Edward Goresline, Henry Hamilton Bennett, Herbert Spencer, Jesse Edward Harmond, Leslie Rushton Hawthorn, Myron Sallee Anderson, Oscar Roland Mathews, Ralph William Marquis, United States. Department of Agriculture, Elbert Hann Reid, Forrest G. Bell, Frank Nelson Harmon, Kirby M. Hayes, Leonard M. Klein, Lester Alan Thompson, Max Raymond Osburn, Sidney Fay Blake, Thomas Wallace Whitaker, Alfred W. Otte, Arnon Lewis Mehring, Bert D. Robinson, Paul A. Norman

1951

by Albert Watts Moore, Charles D. Converse, Claron Owens Hesse, Elmer Snyder, Everett Eugene Lund, George Haymaker Vansell, Guy Weston Bohn, Leslie Rushton Hawthorn, Elbert Hann Reid, Frank Nelson Harmon, Lester Alan Thompson, Thomas Wallace Whitaker

1951