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The Hueco Mountains are a north-trending range which occupy an area of about 584 square miles in El Paso and Hudspeth counties, Texas, and in southern Otero County, New Mexico….
Williams, Thomas E.. 1963. "Fusulinidae of the Hueco Group (Lower Permian), Hueco Mountains, Texas." Bulletin of the Peabody Museum of Natural History , (18). https://elischolar.library.yale.edu/peabody_museum_natural_history_bulletin/18