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Continue to ChatVideo: Ground Freezing and the Hetch Hetchy Water Supply Tunnel https://geoprac.net/2012/11/video-ground-freezing-and-the-hetch-hetchy-water-supply-tunnel/
Video: Ground Freezing and the Hetch Hetchy Water Supply Tunnel https://geoprac.net/2012/11/video-ground-freezing-and-the-hetch-hetchy-water-supply-tunnel/