Tunnels
This is a sourced subject-directory page. Its presence does not mean a factual answer has been researched, or that the subject is a proven knowledge gap.
Names and connections
Highway tunnels; Road tunnels
- Broader: Civil engineering
- Broader: Underground construction
- Narrower: Gate roads (Mining)
- Narrower: Railroad tunnels
- Narrower: Shotcrete-lined tunnels
- Narrower: Subway tunnels
- Narrower: Tunnel lining
- Narrower: Underwater tunnels
- Narrower: Water tunnels
Up to 40 narrower headings are shown. Full Library of Congress authority record
Local answer status
No owner-reviewed answer has been published for this exact subject page. This is a gap in this collection; it does not establish that the answer is unavailable elsewhere.
Numeric address and provenance
Morton address: 10088278669660652100 · morton4x16-v1
Coordinates: (0, 20, 19571, 51200). The address interleaves categorical identifier bits. Nearby addresses are not guaranteed to describe semantically similar subjects.
Structured subject record · Markdown · Source snapshots and licenses
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