by University of Texas. Bureau of Business Research, Cynthia R. Bettinger, Charles Tallifero Clark

1963

by University of Georgia. College of Agriculture

1924

by University of Florida. College of Engineering

1901

by University of Idaho

1912

by University of Tennessee (Knoxville campus)

1905

by University of Tennessee (Knoxville campus)

1919

by University of Florida. Agricultural Experiment Station

1920

by Oklahoma A & M College, Oklahoma State University

1930

by University of Cincinnati

1907

by University of Cincinnati

1907

by University of Cincinnati

1897

by University of Tennessee

1915