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San Francisco Waterworks

• Arc Welder at Work
  
• Atop the O'Shaughnessy Dam
  
• Casting Concete Pipe
  
• Face of the Hetch Hetchy Dam
  
• Hetch Hetchy Reservoir
  
• Hetch Hetchy Reservoir
  
• Pipelines on Trestle Bridge
  
• Preparing Ditches for Pipeline
  
• Tractors Doing Grading Work
  
• Waterworks Workers