00664nam 2200169z- 450 9910712660703321(CKB)5470000002495555(EXLCZ)99547000000249555520230509c2008uuuu -u- -engAllegheny Portage Railroad National Historic Site : geologic resource evaluation reportDenver, ColoradoGeologic Resources Division, Natural Resource Program Center ;Allegheny Portage Railroad National Historic Site BOOK9910712660703321Allegheny Portage Railroad National Historic Site : geologic resource evaluation report3350158UNINA