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31 00 00 Earthwork
31 70 00 Tunneling and Mining
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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
31 70 00 Tunneling and Mining
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