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Drilling jumbos mounted on the back of a truck for lower portal Number 4. This first wood-frame jumbo was experimental, later they were steel pipe: photographic print, 1931 September 26
Level of Description
Item
Archival Collection
Six Companies, Inc. Hoover Dam Photograph Collection
Archival Component
Six Companies shovel operation at lower portal Number 4, Arizona side of Black Canyon: photographic print, 1931 September 28
Level of Description
Item
Archival Collection
Six Companies, Inc. Hoover Dam Photograph Collection
Archival Component
Lower portal Number 4, Arizona side of Black Canyon: photographic print, 1931 September 25
Level of Description
Item
Archival Collection
Six Companies, Inc. Hoover Dam Photograph Collection
Archival Component
Government pumping plant at the Colorado River in Black Canyon: photographic print, 1931 August 07
Level of Description
Item
Archival Collection
Six Companies, Inc. Hoover Dam Photograph Collection
Archival Component
Frigidaire drinking water and water-cooling plant at compressor plant Number 2, Arizona side of Black Canyon: photographic print, 1931 August 09
Level of Description
Item
Archival Collection
Six Companies, Inc. Hoover Dam Photograph Collection
Archival Component
Looking up from a point below the lower portals, showing the government pumping plant (lower left), the Six Companies' compressor plant (middle left), the location of the lower portals, and the highway loop above the canyon wall (upper center): photographic print, 1931 July 30
Level of Description
Item
Archival Collection
Six Companies, Inc. Hoover Dam Photograph Collection
Archival Component
A Six Companies freight barge at the lower portals: photographic print, 1931 September 26
Level of Description
Item
Archival Collection
Six Companies, Inc. Hoover Dam Photograph Collection
Archival Component
Marion electric shovel directly over the dam site during construction of the government highway: photographic print, 1931 September 26
Level of Description
Item
Archival Collection
Six Companies, Inc. Hoover Dam Photograph Collection
Archival Component
Bucyrus-Erie shovel excavation for Site Number 3 compressor plant: photographic print, 1931 June 02
Level of Description
Item
Archival Collection
Six Companies, Inc. Hoover Dam Photograph Collection
Archival Component
Bucyrus-Erie shovel excavation for Site Number 3 compressor plant: photographic print, 1931 June 02
Level of Description
Item
Archival Collection
Six Companies, Inc. Hoover Dam Photograph Collection
Archival Component
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