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The Epic Interactive Encyclopedia 1997
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1992-09-02
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9 lines
Range over 800 km/500 mi long extending from
Pennsylvania to Virginia, USA, rising to more
than 1,500 m/4,900 ft and averaging
750 m/2,500 ft. The mountains are a major
source of timber, coal, iron, and limestone.
They initially hindered western migration,
the first settlement to the W being Marietta
1788.