by Walter Collins O'Kane

1926

by Walter Collins O'Kane

1928

by Walter Collins O'Kane

1925

by Walter Collins O'Kane, New Hampshire Agricultural Experiment Station

1914

by Bert E. Curry, David Lumsden, Frederick W. Taylor, Joseph Harvey Gourley, Walter Collins O'Kane, Todd Orin Smith, Frank App

1913

by Walter Collins O'Kane, W. A. Osgood, Charles Harvey Hadley

1917

by Walter Collins O'Kane, W. A. Osgood

1922

by Walter Collins O'Kane

1914