Grubenbahn (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "Grubenbahn" in German language version.

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1thehelpfulengineer.com

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fomterv.hu

Szabo Deszö: Die Franz-Josef-Elektrische Untergrundbahn in Budapest. Projektirt und ausgeführt von Siemens & Halske. Budapest 1896 (PDF)

thehelpfulengineer.com

http://thehelpfulengineer.com/index.php/2012/03/the-hidden-railway-irish-peat-bog-railway/