District of Columbia. Section OO, alternative, specifications for construction of concrete pipe tunnels, supplementary concrete tunnel underground high-pressure steam lateral system and tile-duct system for central heating, lighting, and power plant at Washington, D. C.
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District of Columbia. Section OO, alternative, specifications for construction of concrete pipe tunnels, supplementary concrete tunnel underground high-pressure steam lateral system and tile-duct system for central heating, lighting, and power plant at Washington, D. C.
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District of Columbia. Section OO, alternative, specifications for construction of concrete pipe tunnels, supplementary concrete tunnel underground high-pressure steam lateral system and tile-duct system for central heating, lighting, and power plant at Washington, D. C.