Columbia subject headings:
Hölderlin, Friedrich, 1770-1843--Criticism and interpretation.
Hölderlin, Friedrich, 1770-1843--Friends and associates.
Schiller, Friedrich, 1759-1805--Friends and associates.
Harvard subject headings:
Hölderlin, Friedrich, 1770-1843--Criticism and interpretation.
Princeton subject headings:
Hölderlin, Friedrich, 1770-1843--Criticism and interpretation.