Illustrated description of first 8. 75 mi of deep level tunnel system planned to have eventually length of nearly 50 mi; completed section is not yet in operation. (See also - n 4476 Oct 24 1941 p 268-70, n 4477 Oct 31 1941 p 288-90)
Underground railways at Chicago, U.S.A.
Engineer
Engineer ; 172 , n 4478
1941
3 pages
Article (Journal)
English
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