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"Natural Gas Leak Detection in Pipelines Prepared for U.S. Department of Energy National Energy Technology Laboratory 3610 Collins Ferry Road, P. O. Box 880 Morgantown, WV 26507-0880 by Yudaya Sivathanu En’Urga Inc. 1291-A, Cumberland Avenue West Lafayette, IN 47906"
<https://oilandgasguru.com/underground-gas-pipeline-leak-detection>