Columbia subject headings:
German language--Style--History--Sources.
German language--Written German--History--Sources.
Middle class--Germany--History--19th century--Sources.
Working class--Germany--History--19th century--Sources.
Harvard subject headings:
German language--19th century.
German language--Social aspects.
Germany--Social life and customs.
Middle class--Germany--History--19th century--Sources.
Working class--Germany--History--19th century--Sources.
Princeton subject headings:
German language--Style--History--Sources.
German language--Written German--History--Sources.
Middle class--Germany--History--19th century--Sources.
Working class--Germany--History--19th century--Sources.