by Association of American Agricultural Colleges and Experiment Stations

1915

by Association of American Agricultural Colleges and Experiment Stations. Convention

1919

by Association of American Agricultural Colleges and Experiment Stations. Annual Convention

1889

by Association of Southern Agricultural Workers

1927

by Land Grant College Engineering Association

1913

by National Fertilizer Association (U.S.)

1926

by National Fertilizer Association (1925-1955), National Fertilizer Association (1925-1955).

1930

by Association of Land-Grant Colleges and Universities. Annual Convention

1929

by American Cranberry Growers' Association

1891

by American Association of Farmers' Institute Workers

1905

by Association of Land-Grant Colleges. Convention

1925

by American Country Life Association. Conference

1924