by University of Wisconsin. University Extension

1923

by University of Minnesota

1919

by University of Minnesota. President

1915

by University of Minnesota

1919

by University of Minnesota

1918

by Ohio State University. Cooperative Extension Service

1919

by Ohio State University. College of Agriculture. Extension Service

1917

by Washington State University

1922

by Ohio State University. Columbus. College of Agriculture. Extension Service

1921

by Ohio. State University, Columbus. College of Agriculture. Extension Service

1922

by University of Idaho. College of Agriculture. Extension Division

1919

by University of Hawaii (Honolulu). Agricultural Extension Service

1917