Columbia subject headings:
Harvard subject headings:
Documentary films--Canada--History and criticism.
Documentary films--Great Britain--History and criticism.
Grierson, John, 1898-1972--Criticism and interpretation.
National Film Board of Canada--History.
Princeton subject headings:
Documentary films--Canada--History and criticism.
Documentary films--Great Britain--History and criticism.
Grierson, John, 1898-1972--Criticism and interpretation.
National Film Board of Canada--History.