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Safety practices in tunneling operations at the Hetch Hetchy Water-supply Project, City and County of San Francisco, Calif.

Safety Factors in Construction and Ventilation, Wawona Vehicular Tunnel, Yosemite National Park, California

Published Year

• 1930-1939 (1)
• 1940-1949 (1)

Subject

• Tunneling--Safety measures (1)
• Tunneling. (1)
• Tunnels -- Ventilation. (1)

Author

• Ash, S. H. (2) *
• Rankin, Carl R. (1)

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