by Charles H. Maine

1989

by Maine. Board of Agriculture

1901

by Maine Agricultural Experiment Station

1916

by Maine Agricultural Experiment Station

1930

by Maine Fertilizer Control and Agricultural Experiment Station

1885

by University of Maine

1898

by University of Maine

1898

by University of Maine at Orono

1927

by Maine. Dept. of Agriculture

1890

by Maine. Board of Agriculture

1879

by Maine. Department of Agriculture

1901

by Maine. Dept. of Agriculture

1904