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History of the steam engine - Wikipedia
Steam engine | Definition, History, Impact, & Facts | Britannica
The History of Steam Engines - ThoughtCo
Steam power | History, Uses, & Facts | Britannica
Watt Steam Engine - World History Encyclopedia
Steam engine - Wikipedia
The Steam Engine in the British Industrial Revolution
History of the Watt Steam Engine - HowStuffWorks
Watt steam engine | Definition, History, & Facts | Britannica
Invention and Development of the Steam Engine - ThoughtCo