Underground space [electronic resource] : the 4th dimension of metropolises : Proceedings of the World Tunnel Congress Prague, Czech Republic, 5-10 May 2007 /

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• Underground space : the 4th dimension of metropolises : Proceedings of the World Tunnel Congress Prague, Czech Republic, 5-10 May 2007 /
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  Cyhoeddwyd: (2007)
• Underground : the way to the future /
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  Cyhoeddwyd: (2013)
• Some examples of underground development in Europe/
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  Cyhoeddwyd: (1974)
• North American tunneling 2006 : proceedings of the North American tunneling conference 2006 ;10-15 June 2006, Chicago, USA /
  gan: Proceedings of the North American Tunneling 2006 Conference (2006 : Chicago, USA), et al.
  Cyhoeddwyd: (2006)
• North American tunneling 2006 [electronic resource] : proceedings of the North American tunneling conference 2006 ;10-15 June 2006, Chicago, USA /
  gan: Proceedings of the North American Tunneling 2006 Conference (2006 : Chicago, USA), et al.
  Cyhoeddwyd: (2006)