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Silicified Middle Ordovician Trilobites. H. B. Whittington and W. R. Evitt, II. Geological Society of America, New York, 1953. 137 pp. Illus. + plates. $3

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Science  18 Jun 1954:
Vol. 119, Issue 3103, pp. 873
DOI: 10.1126/science.119.3103.873
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