Columbia subject headings:
Ostfriesland (Germany)--History--18th century.
Ostfriesland (Germany)--Statistics.
Harvard subject headings:
Ostfriesland (Germany)--History--18th century.
Ostfriesland (Germany)--Statistics.
Princeton subject headings:
Ostfriesland (Germany)--History--18th century.
Ostfriesland (Germany)--Statistics.
Statistics.