U.S. Department of Agriculture (USDA) Secretary Sonny Perdue Governor Mark Gordon and US Representative Liz Cheney visit an open-pit coal mine, in the Thunder Basin National Grassland, near Wright, Wyoming, on July 29, 2019. The mining truck's 3,400 h.p. engine drives generators that power electric motors to propel the truck with a nominal load of 372 tons. USDA Photo By Lance Cheung.
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Lance Cheung/Multimedia PhotoJournalist
2019-07-30 17:30
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