Columbia subject headings:
Harvard subject headings:
Communication--Political aspects--Europe--History--18th century.
Diplomacy--Language--History--18th century.
Peace movements--Europe--History--18th century.
Peace treaties
Peace-building--Europe--History--18th century.
Princeton subject headings:
Communication--Political aspects--Europe--History--18th century.
Diplomacy--Language--History--18th century.
Peace movements--Europe--History--18th century.
Peace treaties.
Peace-building--Europe--History--18th century.