Excerpt from Status of the Mesozoic Floras of the United States, Vol. 2: Second Paper, PlatesSouth Dakota Exposure of the Potomac formation on Ontario avenue, Washington, D. C Exposure of the Potomac formation on Kansas avenue, Washington, D. C Exposure of the Potomac formation on Sixteenth street, Washington, D. C Exposures of the Potomac formation at Terra Cotta, D. C Exposures of the Potomac formation at Freestone, Virginia Exposures Of the...
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