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<p>Bibliography: p. 34-44
</p>
<br>Subjects: Geology -- Maryland; Geology, Stratigraphic -- Cambrian; Paleontology -- Maryland; Paleontology -- Cambrian; Paleontology -- Ordovician</div>
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<dl><dd>Maryland Geological Survey</dd>
<dd>Bassler, Ray S. (Ray Smith), b. 1878</dd></dl></div>
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