Tuneladora (Catalan Wikipedia)

Analysis of information sources in references of the Wikipedia article "Tuneladora" in Catalan language version.

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brunel200.com

«Major Projects: The Thames Tunnel» (en anglès). Brunel 200, 2006. [Consulta: 6 febrer 2015]. «In 1818, Marc Brunel patented a tunnelling shield made from iron, inspired by the head of the ship-worm which could bore through ship’s timbers.»