The term 'multivolume ref' refers to two reference works: the Encyclopedia (ENCYC) and the Oxford English Dictionary (OED). The Encyclopedia is a five-volume set of books that provides comprehensive information on a wide range of topics. The OED is a three-volume set of books that contains the full text of the English language, including definitions, etymologies, and pronunciations. Both of these reference works are invaluable resources for students, researchers, and anyone interested in learning more about the English language.