Columbia subject headings:
Harvard subject headings:
Comic books, strips, etc.--United States--History and criticism--20th century.
Comic books, strips, etc.--United States--History and criticism--21st century.
Comic strip characters--United States--History--20th century.
Comic strip characters--United States--History--21st century.
Popular culture--United States--History--20th century
Popular culture--United States--History--21st century.
Superman (Fictitious character)
Superman (Fictitious character)--In mass media--History--20th century.
Superman (Fictitious character)--In mass media--History--21st century.
Superman films--History and criticism--20th century.
Superman films--History and criticism--21st century.
Princeton subject headings:
Comic books, strips, etc.--United States--History and criticism--20th century.
Comic books, strips, etc.--United States--History and criticism--21st century.
Comic strip characters--United States--History--20th century.
Comic strip characters--United States--History--21st century.
Popular culture--United States--History--20th century.
Popular culture--United States--History--21st century.
Superman (Fictitious character)
Superman (Fictitious character) in mass media--History--20th century.
Superman (Fictitious character) in mass media--History--21st century.
Superman films--History and criticism--20th century.
Superman films--History and criticism--21st century.