Lekas, M. A.; Lekas, J. M. & Strickland, F. G. Initial evaluation of fracturing oil shale with propellants for in situ retorting, Phase 2, report, May 1, 1991; (https://digital.library.unt.edu/ark:/67531/metadc1093781/m1/4/: accessed April 16, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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