Columbia subject headings:
Harvard subject headings:
Comic books, strips, etc.--United States--History and criticism--20th century.
Superhero comic books, strips, etc.--United States--History and criticism--20th century.
Princeton subject headings:
Comic books, strips, etc.--United States--History and criticism--20th century.
Superhero comic books, strips, etc.--United States--History and criticism--20th century.