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Top Terms > Facilities > Specialized facilities > Underground structures > Tunnels > Parts of tunnels

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Parts of tunnels (Pdvtb)

Broader Term
Tunnels (Pdvt)
Narrower Terms
Tunnel lining (Pdvtbm)
Tunnel shafts (Pdvtbr)
Tunnel supports (Pdvtbs)
Related Terms (Hierarchical)
Tunnels by use (Pdvtr)