- The Disk Harrow Machine.
- KEYSTONE TILLAGE IMPLEMENTS.
- KEYSTONE TILLAGE IMPLEMENTS
- I.H.C. SERVICE LOCATIONS.
- Cal Covert has his Fifty-Year Service Anniversary on June 1992.
- August 1986 Prime Mover Control Supplement Plant News.
- An International Harvester Company Machine Shop Manufacturing History Project.
- A Woodward Prime Mover Control Plant News History Project.
- A vintage farm equipment machine shop manufacturing history project.
- A vintage farm equipment machine shop manufacturing history project.
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