TY - MAP ID - 138736509 TI - Beaver folio, Pennsylvania : structure and economic geology AU - Woolsey, Lester Hood AU - Clapp, F.G. AU - Goldman, M.I. PY - 1905 PB - Washington, D.C. U.S Geological Survey DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:138736509 AB - ER -