Progress report on construction of 15 1/4 and 16-ft-diam tunnel, 91 mi long, greatest tunneling project of all times; access highways; adits and shafts; tunnel operations; drilling and switching; loading; timbering.
Tunnel progress on Colorado River aqueduct
Eng News-Rec
Engineering News-Record ; 112 , n 5
1934
5 pages
Article (Journal)
English
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