Pennsylvania was once the world's leading producer of which rare, hard variety of coal?
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Northeastern Pennsylvania contains almost all of the nation's anthracite coal reserves. This hard, clean-burning coal fueled the American Industrial Revolution and led to the rapid growth of cities like Scranton and Wilkes-Barre. Photo: Jakec, Wikimedia Commons, CC BY-SA 4.0.
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Source: Wikipedia (CC BY-SA)
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