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Chas E. Beecher

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Ceratiocaridae; Eurypteridae From the Upper Devonian Measures in Warren County; from the Lower Productive Coal Measures in Beaver County, Lower Carboniferous, Pithole Shale, in Venango County (Classic Reprint)
Ceratiocaridae; Eurypteridae From the Upper Devonian Measures in Warren County; from the Lower Productive Coal Measures in Beaver County, Lower Carboniferous, Pithole Shale, in Venango County (Classic Reprint)