Columbia subject headings:
Hegel, Georg Wilhelm Friedrich, 1770-1831--Contributions to the philosophy of nature.
Kant, Immanuel, 1724-1804.
Philosophy of nature.
Harvard subject headings:
Hegel, Georg Wilhelm Friedrich, 1770-1831--Contributions in philosophy of nature.
Kant, Immanuel, 1724-1804--Contributions in philosophy of nature.
Philosophy of nature--History
Princeton subject headings:
Hegel, Georg Wilhelm Friedrich, 1770-1831.
Kant, Immanuel, 1724-1804.
Philosophy of nature--History.