. Bulletin of the Geological Society of America. Geology. BULL. GEOL SOC. AM. VOL. 16, 1904, PL. 58. Figure 2.—The Same with Crossed and Gypsum Plate. X 05 PHOTOMICROGRAPHS OF HYPERSTHENE-GABBRO Two miles southeast of Bervvyn, Chester county, Pennsylvania. Photographed F. J. Keeley. 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 Geological Society of America. [New York : The Society]

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890