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Top Terms > Facilities > Specialized facilities > Underground structures > Tunnels > Tunnels by use

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Tunnels by use (Pdvtr)

Broader Term
Tunnels (Pdvt)
Narrower Terms
Pedestrian tunnels (Pdvtrn)
Pressure tunnels (Pdvtrp)
Railroad tunnels (Pdvtrr)
Vehicular tunnels (Pdvtrv)
Related Terms (Hierarchical)
Parts of tunnels (Pdvtb)