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31 Earthwork
31 70 00 Tunneling and Mining
31 70 00 Tunneling and Mining
- 31 71 00 Tunnel Excavation
- 31 72 00 Tunnel Support Systems
- 31 73 00 Tunnel Grouting
- 31 74 00 Tunnel Construction
- 31 75 00 Shaft Construction
- 31 77 00 Submersible Tube Tunnels