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This July 19, 2016 photo shows a 1910 Avery steam engine tractor owned by Keith Murray of Murraymere Farms near Powell, Wyo. The huge tractor was one of several historical demonstrations at an event at the University of Wyoming's Powell Research and Extension Center. (Ilene Olson/The Powell Tribune via AP)

This July 19, 2016 photo shows a 1910 Avery steam engine tractor owned by Keith Murray of Murraymere Farms near Powell, Wyo. The huge tractor was one of several historical demonstrations at an event at the University of Wyoming's Powell Research and Extension Center. (Ilene Olson/The Powell Tribune via AP)

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