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Among the substances that are dug up becau … Among the substances that are dug up because they are useful, those known simply as coals are made of earth, and they are set on fire and burnt like charcoal. They are found in Liguria, where amber also occurs, and in Elis as one goes by the mountain road to Olympia; and they are actually used by workers in metals." <br/>-Theophrastus of Eresos, On Stones."
-Theophrastus of Eresos, On Stones +
-Theophrastus of Eresos, On Stones +
false +
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