Columbia subject headings:
Protestants--Germany--Bonn--History--19th century.
Social structure--Germany--Bonn--History--19th century.
Harvard subject headings:
Protestants--Germany--Bonn--History--19th century.
Social structure--Germany--Bonn--History--19th century.
Princeton subject headings:
Protestants--Germany (West)--Bonn--History--19th century.
Social structure--Germany (West)--Bonn--History--19th century.