Ward, Peter L. & Koyanagi, Robert. The Use of Microearthquakes in Prospecting for Geothermal Areas and Magma Chambers, article, January 1, 1974; (https://digital.library.unt.edu/ark:/67531/metadc873830/m1/1/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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