- Bracker, M. Leone, 1885-1937 (2)
- Burgess, J. S. (2)
- Christy, Howard Chandler, 1873-1952 (2)
- Delboy, Marcel (2)
- Faivre, Abel, 1867-1945 (2)
- Fisher, Harrison, 1875-1934 (2)
- Geographical Publishing Co (2)
- Geological Survey (U.S.) (2)
- Iowa Seed Co. (2)
- Jacobs, Leonebel (2)
- Matthews (2)
- McCloy, C. H. (2)
- McGill-Warner Co. (2)
- Minnesota Historical Society (2)
- Mott, John R. (John Raleigh), 1865-1955 (2)
- Olds, L. L., Seed Company (2)
- Sem, 1863-1934 (2)
- Siler, Charles A. (2)
- Stark Bro's Nurseries (2)
- United States. Army. Engineer Regiment, 29th (2)
