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Hauling rock to the crushing mill at the Grenoble Quarry, Bucks County, PA, circa 1910.
flipFlip to The north east Grenoble Quarry, Northampton Township between Ivyland and Rushland, Bucks County, PA, circa 1910.
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A man sits in the driver's seat of a wagon full of rocks. There are three mules harnessed to the wagon.

Credit: Pennsylvania, Keystone to Progress, by Edward Miller

In the Middle Ages, slate was quarried primarily for floor tiles and roof shingles. By the mid-1800s, it was also used for counter tops, billiard tables, school black boards, window sills, and lintels.

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