Book (Practical) Construction and civil engineering Underdrain Paradise!

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

Construction and Civil Engineering
The bridge ruins that appear without a river, the meandering roads, and the sidewalks that are too wide compared to roadways. The discomfort in the city may have been that they were underdrains. Under drains × cats / railways / people, two people with different angles run through the Maniac Road. Local underdrains are also introduced. This is the definitive edition of the underdrain street walking book!