- Covington, H. M.1
- Crampton and Deitrick1
- Darch, Douglas1
- Deere & Company1
- Farm Equipment Institute1
- Farm Journal (Philadelphia, Pa. : 1956)1
- Fields, Hugh1
- Flue-Cured Tobacco Farmer1
- Food Machinery and Chemical Corporation1
- Forster, G. W.1
- Fox, William R.1
- Guthrie, F. E. (Frank Edwin), 1923-19941
- Hassler, Francis J.1
- Henson, Wiley H., Jr.1
- Hsieh, Ken1
- Imperial Tobacco Group1
- J. G. Van Holten and Sons, Inc. (Waterloo, Wisconsin)1
- James, H. Brooks (Herman Brooks), 1912-19731
- Jones, Ed1
- Kolbe, Melvin H.1