- North Carolina State College. Department of Agricultural Engineering6
- North Carolina State University. Department of Biological and Agricultural Engineering5
- Johnson, William H.3
- North Carolina Agricultural Extension Service3
- Splinter, William E.3
- Suggs, Charles W.2
- Capitol Agricultural Service and Supply Co.1
- Corneli Seed Company1
- Covington, H. M.1
- Darch, Douglas1
- Farm Journal (Philadelphia, Pa. : 1956)1
- Fields, Hugh1
- Flue-Cured Tobacco Farmer1
- Fox, William R.1
- J. G. Van Holten and Sons, Inc. (Waterloo, Wisconsin)1
- Jones, Ed1
- Leary, Samuel L. (Samuel Linton), 1863-19131
- Lockwood Grader Corporation1
- Mt. Olive Pickle Company, Inc.1
- National Institute for Medical Research1