TUNNELS ACCORDING TO LOCATION
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BTTUNNEL STRUCTURES (TUNNELLING)
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UDC624.19.03
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Descriptor GERTUNNELBAUTEN NACH LAGE
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Descriptor ENGTUNNELS ACCORDING TO LOCATION
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Descriptor FRETUNNELS SELON L'EMPLACEMENT
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NTMOUNTAIN TUNNELS + ALPINE TUNNELS (TUNNELLING)
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NTSHALLOW TUNNELS + NEAR-SURFACE TUNNELS (TUNNELLING)
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NTUNDERWATER TUNNELS + SUBAQUEOUS TUNNELS (TUNNELLING)