Columbia subject headings:
Motion pictures--History--20th century.
Motion pictures--Production and direction--History--20th century.
Science fiction films--History and criticism.
Technology in motion pictures--History--20th century.
Harvard subject headings:
Motion pictures--History--20th century
Motion pictures--Production and direction--History--20th century.
Science fiction films--History and criticism
Technology in motion pictures--History--20th century.
Princeton subject headings:
Motion pictures--History--20th century.
Motion pictures--Production and direction--History--20th century.
Science fiction films--History and criticism.
Technology in motion pictures--History--20th century.