Cite
APA Citation
Unknown (2013). Mechanised shield tunnelling. Place of publication not identified : Ernst & Sohn. http://access.bl.uk/ark:/81055/vdc_100101837743.0x000001
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Unknown (2013). Mechanised shield tunnelling. Place of publication not identified : Ernst & Sohn. http://access.bl.uk/ark:/81055/vdc_100101837743.0x000001