by University of Massachusetts (Amherst campus). Cooperative Extension Service

1912

by University of California Agricultural Extension Service

1921

by University of Massachusetts (Amherst campus). Cooperative Extension Service

1927

by University of Tennessee (Knoxville campus). Department of Agricultural Education

1921

by Ohio State University. College of Agriculture. Extension Service

1917

by University of Arkansas, Fayetteville. Agricultural Extension Service

1923

by University of Vermont. Agricultural Extension Service

1928

by University of Missouri. Agricultural Extension Service

1926

by University of Rhode Island. Extension Service

1922

by University of Connecticut. College of Agriculture. Extension Service

1916

by Tennessee. University. Agricultural Extension Service

1922

by University of Wisconsin. Agricultural Experiment Station

1913