by University of Wisconsin. Extension Service

1918

by Ohio State University. College of Agriculture. Extension Service

1917

by Kentucky. University. Agricultural Extension Service

1922

by South Dakota State University. Cooperative Extension Service

1917

by University of Minnesota

1919

by Purdue University. Department of Agricultural Extension

1922

by University of Florida

1929

by University of California Agricultural Extension Service

1921

by University of Arkansas (Fayetteville campus)

1922

by Ohio State University. Agricultural Extension Service

1908

by South Dakota Agricultural College, South Dakota State College of Agriculture and Mechanic Arts, South Dakota State University

1919

by University of Minnesota

1929