Columbia subject headings:
Comic books, strips, etc.--United States.
Comics (Graphic works)
Good and evil--Comic books, strips, etc.
Graphic novels.
Life on other planets--Comic books, strips, etc.
Metropolis (Imaginary place)--Comic books, strips, etc.
Superhero comic books, strips, etc.
Superman (Fictitious character)--Comic books, strips, etc.
Harvard subject headings:
Comic books, strips, etc.--United States.
Good and evil--Comic books, strips, etc.
Graphic novels
Life on other planets--Comic books, strips, etc.
Metropolis (Imaginary place)--Comic books, strips, etc.
Science fiction comics
Superhero comics
Superheroes--Comic books, strips, etc.
Superman (Fictitious character)--Comic books, strips, etc.
Princeton subject headings: