USGS · oc82
Preliminary stratigraphic cross section showing radioactive zones in the Devonian black shales in eastern Ohio and west-central Pennsylvania
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John B. Roen, Laure G. Wallace, Wallace De Witt. 1978. Preliminary stratigraphic cross section showing radioactive zones in the Devonian black shales in eastern Ohio and west-central Pennsylvania. https://doi.org/10.3133/oc82
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