Columbia subject headings:
Harvard subject headings:
Frederick August, I, Duke of Oldenburg, 1711-1785
Germany--Kings and rulers--Biography
Schleswig-Holstein (Germany)--History--18th century.
Princeton subject headings:
Frederick August, I, Duke of Oldenburg, 1711-1785.
Germany--Kings and rulers--Biography.
Schleswig-Holstein (Germany)--History--18th century--Biography.