Columbia subject headings:
Literature, Modern--History and criticism--Congresses.
Nature in literature--Congresses.
Philosophy of nature--Congresses.
Harvard subject headings:
German literature--History and criticism--Congresses
Literature, Modern--History and criticism--Congresses
Nature in literature--Congresses.
Philosophy of nature--Congresses
Princeton subject headings:
German literature--History and criticism--Congresses.
Literature, Modern--History and criticism--Congresses.
Nature in literature--Congresses.
Philosophy of nature--Congresses.