Columbia subject headings:
Heine, Heinrich, 1797-1856--Criticism and interpretation--Congresses.
Heine, Heinrich, 1797-1856--Language--Congresses.
Harvard subject headings:
Heine, Heinrich, 1797-1856--Language--Congresses.
Heine, Heinrich, 1797-1856--Literary style--Congresses.
Poetics--Congresses
Princeton subject headings:
Heine, Heinrich, 1797-1856--Criticism and interpretation--Congresses.
Heine, Heinrich, 1797-1856--Language--Congresses.