by University of California, Berkeley

1961

by Ohio State University. Agricultural Extension Service

1914

by North Dakota State University. Extension Service

1926

by University of Missouri. Agricultural Extension Service

1926

by Ohio State University

1929

by Ohio State University. Cooperative Extension Service

1910

by University of Wisconsin. College of Agriculture. Agricultural Extension Service

1914

by University of Hawaii (Honolulu). Agricultural Extension Service

1929

by West Virginia University. Agricultural Extension Service

1927

by University of Minnesota

1927

by University of Minnesota

1915

by University of Minnesota

1926