Columbia subject headings:
Heidegger, Martin, 1889-1976.
Senghor, Léopold Sédar, 1906-2001.
Harvard subject headings:
Heidegger, Martin, 1889-1976--Criticism and interpretation.
Senghor, Léopold Sédar, 1906-2001--Criticism and interpretation.
Princeton subject headings: