Hellman, Edward W., Elvis A. Takow, Maria D. Tchakerian, and Robert N. Coulson. “Geology and Wine 13. Geographic Information System Characterization of Four Appellations in West Texas, USA”. Geoscience Canada 38, no. 1 (January 1, 2011). Accessed July 22, 2019. https://journals.lib.unb.ca/index.php/GC/article/view/18587.