Columbia subject headings:
Economics--Early works to 1800.
Philosophy--Early works to 1800.
Political science--Early works to 1800.
Science--Early works to 1800.
Utopias--Early works to 1800.
Harvard subject headings:
Economics--Early works to 1800
Philosophy--Early works to 1800
Political science--Early works to 1800
Science--Early works to 1800
Utopias--Early works to 1800
Princeton subject headings: