TY - BOOK ID - 135907269 TI - Petrology of the paleozoic shales of Illinois AU - Grim, Ralph E. AU - Bradley, William F. AU - White, W. Arthur PY - 1957 PB - Urbana Illinois state geological survey DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:135907269 AB - ER -