Columbia subject headings:
Hegel, Georg Wilhelm Friedrich, 1770-1831. Naturphilosophie--Congresses.
Philosophy of nature--Congresses.
Harvard subject headings:
Hegel, Georg Wilhelm Friedrich, 1770-1831. Naturphilosophie--Congresses.
Philosophy of nature--Congresses
Princeton subject headings:
Hegel, Georg Wilhelm Friedrich, 1770-1831. Naturphilosophie--Congresses.
Philosophy of nature--Congresses.