01636nam 22004091a 450 991070819310332120131031002238.0(OCoLC)866987843(MiFhGG)NCCO2001390(CKB)4920000002449183(EXLCZ)99492000000244918320131031d1896 ua 0engur|n||||||||nThe ancient volcanic rocks of South Mountain, Pennsylvaniaby Florence BascomWashington G.P.O.18961 online resource ([4], [viii], 124 p., [24] leaves of plates) ill., map54th Congress, 1st Session. House of Representatives. Document ;no. 421Bulletin of the United States Geological Survey ;no. 136Nineteenth Century Collections Online: Science, Technology, and Medicine, Part IAdvertising: p. [i]-vii, 2nd count.Reproduction of the original from the Library of Congress.House document (United States. Congress. House) ;54th Congress, 1st session, no. 421.Bulletin of the United States Geological Survey ;no. 136.Nineteenth Century Collections Online: Science, Technology, and Medicine, Part I.PetrologyIgneous rocksPennsylvaniaPetrology.Igneous rocks.Bascom F(Florence),1862-1945.1387723MIGCLUtOrBLWBOOK9910708193103321The ancient volcanic rocks of South Mountain, Pennsylvania4129270UNINA