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  Category:Fremont County, Colorado – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Fremont_County,_Colorado?uselang=de

  Keine Beschreibung vorhanden.

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  The Face of Decline: The Pennsylvania Anthracite Region in the Twentieth Century - Thomas Dublin, Walter Licht - Google Books

  https://books.google.de/books?id=pp49DQAAQBAJ&dq=%22Philadelphia+&+Reading+Coal+&+Iron+Corporation%22&hl=de&source=gbs_navlinks_

  The anthracite coal region of Pennsylvania once prospered. Today, very little mining or industry remains, although residents have made valiant efforts to restore the fabric of their communities. In The Face of Decline, the noted historians Thomas Dublin…

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  Pennsylvania (USA): Kreise & Orte - Einwohnerzahlen, Grafiken und Karte

  http://www.citypopulation.de/php/usa-pennsylvania_d.php

  Pennsylvania (USA): Kreise & Orte mit Bevölkerungsstatistiken, Diagrammen und Karte.

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