. Bulletin - New York State Museum. Science. PLATE 20 To face page 643. C. M. Doyle, photo. Different varieties of brick 1 Roman tile. 2 Norman tile. 3 Dry pressed brick speckled with manganese. 4 Rock 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 New York State Museum; New York State Museum. Albany : New York State Education Dept

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887