Não informado. (1999). Contributions to Geology. University of Wyoming, Department of Geology.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Contributions to Geology. Laramie, Wyo: University of Wyoming, Department of Geology, 1999.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Contributions to Geology. University of Wyoming, Department of Geology, 1999.
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