Superman, Batman

["Superman (Fictitious character)" "Graphic novels" "Batman (Fictitious character)" "Comic books strips" "Fiction - Fantasy" "Juvenile Fiction" "Children: Young Adult (Gr. 7-9)" "Graphic Novels - Superheroes" "Fiction / Graphic Novels" "Comics & Graphic Novels - Superheroes" "Comic books strips etc" "Fiction" "Comics & Graphic Novels" "Fantasy" "Superman (fictitious character) fiction" "Batman (fictitious character) fiction" "Comics & graphic novels general" "Comics & graphic novels science fiction"]