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The Stratigraphic Succession of the Fossil Floras of the Pottsville Formation in the Southern Anthracite Coal Field, Pennsylvania
- "The Stratigraphic Succession of the Fossil Floras of the Pottsville Formation in the Southern Anthracite Coal Field, Pennsylvania"@en
- "The stratigraphic succession of the fossil floras of the Pottsville formation : in the southern anthracite coal field, Pennsylvania"@en
- "The stratigraphic succession of the fossil floras of the Pottsville formation in the southern anthracite coal field, Pennsylvania"
- "The stratigraphic succession of the fossil floras of the Pottsville formation in the southern anthracite coal field, Pennsylvania"@en