Columbia subject headings:
Knigge, Adolf, Freiherr von, 1752-1796--Correspondence.
Reden, Philippine von, 1775-1841.
Harvard subject headings:
Knigge, Adolf, Freiherr von, 1752-1796--Correspondence.
Reden, Philippine von, 1775-1841--Correspondence.
Princeton subject headings:
Authors, German--Biography.
Authors, German--Correspondence.
Knigge, Adolf, Freiherr von, 1752-1796--Correspondence.
Knigge, Adolf, Freiherr von, 1752-1796.
Reden, Philippine von, 1775-1841.
Women authors--Germany--Philosophy.