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Excerpt from Las Rhyolitas de México
El crecido número de ejemplares y de preparaciones microscópicas con que cuenta ya el Instituto Geológico, nos permiten emprender este trabajo, que tie ne, entre otros muchos objetos, el de uniformar la nomenclatura petrográñca en México y el de dar 8 conocer la grande variedad que de cada familia de rocas se conoce en el país.
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