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| Promoting the design, development, construction, and use of underground facilities. |
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| Google PR |
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| Encourages planning of the subsurface and promotes the use of tunnels. |
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| Google PR |
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| Includes reports on major United States road tunnel projects. |
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| Google PR |
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| Covering history, projects, products, research, and development. |
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| Google PR |
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| Find routes on subway systems of various cities around the world. |
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| Google PR |
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