Columbia subject headings:
Hegel, Georg Wilhelm Friedrich, 1770-1831.
Philosophy of nature--History--19th century.
Philosophy of nature.
Harvard subject headings:
Hegel, Georg Wilhelm Friedrich, 1770-1831--Contributions in philosophy of nature.
Philosophy of nature--History--19th century.
Princeton subject headings:
Hegel, Georg Wilhelm Friedrich, 1770-1831.
Knowledge, Theory of.
Philosophy of nature.
Reflection (Philosophy)