Columbia subject headings:
German language--Rhetoric--History--19th century.
German language--Rhetoric--History--20th century.
Letter writing, German--History--19th century.
Letter writing, German--History--20th century.
Harvard subject headings:
German language--Rhetoric--History--19th century.
German language--Rhetoric--History--20th century.
Letter-writing, German--History--19th century.
Letter-writing, German--History--20th century.
Princeton subject headings:
Letters--History and criticism.