. Bulletin of the Essex Institute. Essex Institute; Natural history. Fig. Fig. 1. IMPLEMENT OF ARGILLITE FROM TUE TrENTON GRAVEL. J-. 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 Essex Institute. Salem, Mass. : Essex Institute

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Keywords: ., booka, bookcentury1800, bookdecade1860, booksubjectnaturalhistory