- American Society of Agricultural Engineers2
- Atkins, Gene1
- Barlow, Frank D. (Frank Downer), Jr., 1916-1
- Bittner, Carl1
- Campbell Heating Co.1
- Campbell, John S.1
- Capitol Agricultural Service and Supply Co.1
- Carleton, Walter M.1
- Chang, Changsoo3
- Cooley, Harold Dunbar, b. 18971
- Cooper, Robert A.2
- Corneli Seed Company1
- 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