Smith, E. W. Hydrology and Model of the Okoy Geothermal Field, Negros Oriental, Republic of the Philippines, article, December 16, 1980; (https://digital.library.unt.edu/ark:/67531/metadc884660/m1/1/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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