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Steam tractor - Wikipedia
John Fowler (agricultural engineer) - Wikipedia
Benjamin Holt - Wikipedia
Caterpillar | 1800s: Holt's First Steam Traction Engine Tractor
The First Steam Tractor? - Farm Collector
The History and Evolution of Tractors - ThoughtCo
Early Steam Tractor Design - Farm Collector
Machinery Milestones: The world’s first tractors
These tractors show 150 years of farming history
Daniel Best Builds His First Steam Traction Engine Tractor