Columbia subject headings:
Paradox--Early works to 1800.
Proposition (Logic)--Early works to 1800.
Semantics (Philosophy)--Early works to 1800.
Harvard subject headings:
Paradox--Early works to 1800.
Proposition (Logic)--Early works to 1800.
Semantics (Philosophy)--Early works to 1800.
Princeton subject headings:
Insolubilia (Logic)--Early works to 1800.