- Beasley, Eustace O. (Eustace Orland)2
- North Carolina Agricultural Extension Service2
- North Carolina State College. Department of Agricultural Engineering2
- Capitol Agricultural Service and Supply Co.1
- Corneli Seed Company1
- Covington, H. M.1
- Farm Journal (Philadelphia, Pa. : 1956)1
- Fields, Hugh1
- J. G. Van Holten and Sons, Inc. (Waterloo, Wisconsin)1
- Jones, Ed1
- Lockwood Grader Corporation1
- Mt. Olive Pickle Company, Inc.1
- National Institute of Agricultural Engineering (Great Britain)1
- New York State College of Agriculture. Dept. of Agricultural Engineering1
- North Carolina Agricultural Experiment Station1
- North Carolina Agricultural Research Service1
- North Carolina State College. School of Agriculture1
- North Carolina State College. School of Forestry1
- Reynolds, Hal1
- Splinter, William E.1