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Description of the coal flora of the Carboniferous formation in Pennsylvania and throughout the United States Plate XXII . SccMDiicI oi Sui lViiiisliiii 'S ii iricux LS' K'c Voi icss ' jil Klopii olT IMi leXXl Plate XXII Illustration biodiversitylibrary org Geological Survey of Pennsylvania Lesquereux Leo Pennsylvania