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Continue to ChatFeb. 7 Bertha update: Two factors contributed to tunnel stoppage https://geoprac.net/2014/02/feb-7-bertha-update-two-factors-contributed-to-tunnel-stoppage/
Feb. 7 Bertha update: Two factors contributed to tunnel stoppage https://geoprac.net/2014/02/feb-7-bertha-update-two-factors-contributed-to-tunnel-stoppage/