01722oam 2200529 450 991070375890332120150520154032.0(CKB)5470000002434131(OCoLC)881832111(EXLCZ)99547000000243413120140626d1889 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierFossil wood and lignite of the Potomac formation /by Frank Hall KnowltonWashington, D.C. :Department of the Interior, United States Geological Survey,1889.Washington, D.C. :Government Printing Office.1 online resource (72 pages, VII pages of plates) illustrationsBulletin of the United States Geological Survey ;no. 56Title from title screen (viewed June 23, 2014).Includes bibliographical references and index.LignitePaleobotanyCretaceousPaleobotanyUnited StatesCretaceous Geologic PeriodfastLignitefastPaleobotanyfastUnited StatesfastLignite.PaleobotanyPaleobotanyCretaceous Geologic Period.Lignite.Paleobotany.Knowlton Frank Hall1860-1926,1353956Geological Survey (U.S.),COPCOPOCLCOOCLCFGPOBOOK9910703758903321Fossil wood and lignite of the Potomac formation3535040UNINA