Younker, L. W.; Donohue, M. L. & Peterson, S. J. Earth Sciences annual report, 1987, report, December 1, 1988; (https://digital.library.unt.edu/ark:/67531/metadc1113396/m1/1/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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