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Construction phase of the Boulder Canyon Project; first round of drilling to enlarge the upper portal of diversion tunnel No. 2; the welded steel "Jumbo Rig" mounted on the truck has 25 air drills on it; the swing shift crew standing next to the rig prepare for work, 1931 November 18

Level of Description
File
Identifier
0071_0027
Date
1931 November 18
Container
Folder 02,
To request this item in person:
Collection Number: PH-00071
Collection Name: Bureau of Reclamation Photographs of the Hoover Dam and Boulder City, Nevada
Box/Folder: Folder 02 (Restrictions apply)
English