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Glerum, A. (author), Rigter, B.P. (author), Eysink, W.D. (author), Heins, W.F. (author)
The concept of a tunnel is very general. A classification can be made by use, geographical conditions, type of construction and so on. Tunnel engineering is not only very extensive, it is also ancient: a tunnel with a length of 1 km is thought to have been built under the Euphrates more than 4,000 years ago to link the royal palace with a temple...
report 1976