- Carl Sagan Observatory at Cerro Azul - - Area de Astronomia of the Departamento de Investigacion en Fisica of the Universidad de Sonora. Programs, courses of study, infrastructure, news, activities and astrological events.
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- Large Millimeter Telescope - - Construction of a single-dish instrument at Volcán Sierra Negra, Puebla, optimized for observation at 0.85 mm / 4 mm. [English and Spanish.
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