Lytle, R.J.; Laine, E.F. & Lager, D.L. Coal fracture measurements using in situ electrical methods: preliminary results, report, November 20, 1974; (https://digital.library.unt.edu/ark:/67531/metadc1057071/m1/1/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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