Would ISBN also stand for the Classification number?

im doing something for school and i need the classification numbers for these charles dickens books, but my library website has NO classification numbers for Dickens work, tho they have them for everything else. all they have is the ISBN number. Help!|||Sorry, i don't think there is one.... I know there is the Dewey Decimal System for non-fiction. What exactly does the question (or whatever asked you to have the classification number) say? Maybe they mean the number that the library puts on it to help you find it???