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Continue to ChatGround penetrating radar being used to detect potential sinkholes around sewer pipes https://geoprac.net/2012/01/ground-penetrating-radar-being-used-to-detect-potential-sinkholes-around-sewer-pipes/
Ground penetrating radar being used to detect potential sinkholes around sewer pipes https://geoprac.net/2012/01/ground-penetrating-radar-being-used-to-detect-potential-sinkholes-around-sewer-pipes/