Columbia subject headings:
Ethics--History.
History--Philosophy.
Metaphysics--History.
Philosophy, Modern--20th century.
Science--Philosophy.
Harvard subject headings:
Ethics--History
History--Philosophy
Metaphysics--History
Philosophy, Modern--20th century.
Science--Philosophy
Princeton subject headings:
Ethics--History.
History--Philosophy.
Metaphysics--History.
Philosophy, Modern--20th century.
Science--Philosophy.