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Excerpt from Algunas Regiones Petrolíferas de México
Como últimamente se ha tratado de revivir una teoría antigua relativa a la formación del petróleo, y como según esta teoría el azufre y las aguas sulfurosas superficiales, podían considerarse como manifestaciones del pe tróleo del subsuelo, he creido conveniente dedicar un capítulo al estudio del origen del petróleo y de su asociación con otros minerales.
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