TY - BOOK ID - 137729359 TI - Organic-walled microphytoplankton of the Sylvan Shale (Richmondian : Upper Ordovician), Arbuckle Mountains, southern Oklahoma, U. S. A AU - Playford, Geoffrey AU - Wicander, Reed PY - 2006 PB - Norman The University of Oklahoma DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:137729359 AB - ER -