Details of the proposed design by C. C. Conklin. Three tunnels, side by side, for railway, street and footway, constructed of concrete. (See also Eng. News, Feb. 2 1893, p. 100)
Duluth ship canal tunnel
Eng Rec
1893
Aufsatz (Zeitschrift)
Englisch
© Metadata Copyright Elsevier B. V. All rights reserved.
Engineering Index Backfile | 1893
|Aerial transfer ferry bridge over the ship canal at Duluth
Engineering Index Backfile | 1902
Engineering Index Backfile | 1942
Relining the Mauvages Tunnel on the Marne Ship Canal
Engineering Index Backfile | 1913
|Engineering Index Backfile | 1897