by Ohio State University Association

1912

by Harvard University

1924

by Princeton University. Class of 1895

1920

by National University Extension Association

1928

by Purdue University. Dept. of Engineering Extension

1927

by Harvard University

1924

by Purdue University

1930

by Charles Watters Odell, University of Illinois (Urbana-Champaign campus). Bureau of Educational Research, Walter Scott Monroe, Marion Eugene Herriott, Thomas Tristam Hamilton, Max Dissette Engelhart

1929

by Princeton University. Class of 1911

1922

by Brown University

1915

by University of Illinois (Urbana-Champaign campus). Bureau of Educational Research

1930

by Purdue University, Lafayette, Ind. Engineering Extension Department

1930