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

1912

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

1917

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

1927

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

1916

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

1921

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

1914

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

1928

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

1929

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

1914

by University of Massachusetts (Amherst campus)

1915

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

1921