512×338 Picture, treads of vehicle, in Etowah River boring incident, Transco Dalton Expansion Project pipeline, by Troy Harris for Gene Hill, for SpectraBusters.org, 27 April 2016,
http://spectrabusters.org/blog/2016/05/05/etowah-river-boring-incident-transco-dalton-expansion-project-pipeline/
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