Columbia subject headings:
Kant, Immanuel, 1724-1804.
Metaphysics.
Schopenhauer, Arthur, 1788-1860.
Harvard subject headings:
Kant, Immanuel, 1724-1804
Kant, Immanuel, 1724-1804--Contributions in metaphysics.
Metaphysics
Schopenhauer, Arthur, 1788-1860
Schopenhauer, Arthur, 1788-1860--Contributions in metaphysics.
Princeton subject headings:
Kant, Immanuel, 1724-1804.
Metaphysics.
Schopenhauer, Arthur, 1788-1860.