Culver, G. & Reistad, G.M. Evaluation and design of downhole heat exchangers for direct application, report, January 1, 1974; (https://digital.library.unt.edu/ark:/67531/metadc1205108/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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