Excerpt from Algunas Regiones Petroliferas de Mexico
Como ultimamente se ha tratado de revivir una teoria antigua relativa a la formacion del petroleo, y como segun esta teoria el azufre y las aguas sulfurosas superficiales, podian considerarse como manifestaciones del pe troleo del subsuelo, he creido conveniente dedicar un capitulo al estudio del origen del petroleo y de su asociacion con otros minerales.
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