by Burton Orange Longyear, Charles Fletcher Rogers, Charles Iseard Bray, Clifford Leon Corkins, David Wield Robertson, Emil Peter Sandsten, George Milton List, Isaac Ernest Newsom, John William Sjogren, Lawrence Wood Durrell, Llewellyn Alexander Moorhouse, N. D. Sanborn, Otto Vincent Adams, Ross Calvin Thompson, Rupert Alonzo McGinty, Walter George Sackett, William Parker Headden, Alvin Kezer, Earnest A. Lungren, Erwin Louis LeClerg, Floyd Cross, Raymond Terry Burdick, John B. Hutson

1925

by Walter George Sackett

1916

by George Milton List, Isaac Ernest Newsom, Lawrence Wood Durrell, Llewellyn Alexander Moorhouse, Walter George Sackett, William Parker Headden, Erwin Louis LeClerg, Floyd Cross, John B. Hutson, Raymond Terry Burdick

1927

by Benjamin Franklyn Kaupp, Colorado Agricultural Experiment Station, Robert E. Trimble, Walter George Sackett, William Parker Headden

1912

by Walter George Sackett

1919

by Colorado Agricultural Experiment Station, Louis George Carpenter, Philo Kneeland Blinn, Walter George Sackett, William Parker Headden

1911

by Sandsten E. P. (Emil Peter), Alvin Kezer, George E. Egginton, George Henry Glover, Walter George Sackett, Wilfred William Robbins, William L. May, William Parker Headden, Breeze Boyack, Christian Milton Tompkins, Isaac Ernest Newson

1918