Columbia subject headings:
Hölderlin, Friedrich, 1770-1843.
Nietzsche, Friedrich Wilhelm, 1844-1900.
Harvard subject headings:
Hölderlin, Friedrich, 1770-1843
Nietzsche, Friedrich Wilhelm, 1844-1900
Princeton subject headings:
Hölderlin, Friedrich, 1770-1843--Criticism and interpretation.
Nietzsche, Friedrich Wilhelm, 1844-1900.
Nihilism (Philosophy)