Columbia subject headings:
Documentary films.
History, Modern--20th century--Pictorial works.
History, Modern--21st century--Pictorial works.
Harvard subject headings:
Documentary films
History, Modern--20th century--Pictorial works
History, Modern--21st century--Pictorial works.
Princeton subject headings:
Documentary films.
History, Modern--20th century--Pictorial works.
History, Modern--21st century--Pictorial works.