. BoletÃ-n. Página 94. -S â o -o c¡ o S 3 â¢S a. â â. IJ â g 0¡ fS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Instituto Geológico de México; Universidad Nacional de México. Instituto de GeologÃ-a. México : Instituto

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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1910, bookyear1918