Columbia subject headings:
Comedy films--United States--History and criticism.
Motion pictures--United States--History.
Romantic comedy films--United States--History and criticism.
Harvard subject headings:
Comedy films--United States--History and criticism
Motion pictures--United States--History
Romantic comedy films--United States--History and criticism.
Princeton subject headings:
Comedy films--United States--History and criticism.
Motion pictures--United States--History.
Romantic comedy films--United States--History and criticism.