Columbia subject headings:
Classification--History.
Documentation--History.
Information organization--History.
Information services--History.
Knowledge management--History.
Otlet, Paul, 1868-1944.
Harvard subject headings:
Classification--History.
Documentation--History.
Information organization--History.
Information services--History.
Knowledge management--History.
Otlet, Paul, 1868-1944.
Princeton subject headings: