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File:Allegheny County Pennsylvania incorporated and unincorporated areas Pittsburgh highlighted.svg - Wikimedia Commons
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File:Map of Allegheny County Pennsylvania With Municipal and Township Labels.png - Wikimedia Commons
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Map of Allegheny County, Pennsylvania, 1890 : with adjoining parts of Westmoreland, Washington & Beaver counties. | Library of Congress
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Allegheny County gains population for first time in six decades, says census | News | Pittsburgh | Pittsburgh City Paper
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