Columbia subject headings:
Motion pictures--Social aspects--United States--History--20th century.
Motion pictures--United States--History--20th century.
Harvard subject headings:
Motion pictures--Social aspects--United States--History--20th century.
Motion pictures--United States--History--20th century
Princeton subject headings:
Motion pictures--Social aspects--United States--History--20th century.
Motion pictures--United States--History--20th century.