Image: KohleRuhr19JhBrockhaus
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Description: Entwicklung der Kohleförderung im „Rheinisch-Westfälischen Kohlenbecken“, grafische Darstellung der Daten nach Brockhaus' Konversationslexikon, F. A. Brockhaus in Leipzig, Berlin und Wien, 14. Auflage, 1894-1896
Title: KohleRuhr19JhBrockhaus
Credit: Own work
Author: Hogenberg
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
Attribution Required?: Yes
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