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Description of the coal flora of the Carboniferous formation in Pennsylvania and throughout the United States Plate LXIII . Second Oeol Sur PeimsvlvMua Lpsqiifn'eux RcjjoiI of 'r avess Conl VIovh of Plate LXH Plate LXIII Illustration biodiversitylibrary org Geological Survey of Pennsylvania Lesquereux Leo Pennsylvania