Columbia subject headings:
Diez, Heinrich Friedrich von, 1751-1817.
Philosophy, German--18th century.
Harvard subject headings:
Authors, German--19th century--Correspondence
Diez, Heinrich Friedrich von, 1751-1817--Correspondence.
Diplomats--Germany--Correspondence.
Philosophy, German--History--Sources.
Princeton subject headings:
Diez, Heinrich Friedrich von, 1751-1817.
Philosophy, German--18th century.