. On the Cambrian faunas of North America [microform] : preliminary studies. Paleontology; Arthropoda, Fossil; Arthropoda, Fossil; Paléontologie; Arthropodes fossiles; Arthropodes fossiles. '( 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 Walcott, Charles D. (Charles Doolittle), 1850-1927; United States. Geological Survey. Washington : G. P. O.

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Keywords: ., bookcentury1800, bookdecad, booksubjectpaleontology, bookyear1884