Columbia subject headings:
Harvard subject headings:
Ertuğrul (Frigate)
Japan--Relations--Turkey.
Turkey--History, Naval--19th century.
Turkey--History--1878-1909.
Turkey--Relations--Japan.
Warships--Turkey--History.
Princeton subject headings:
Ertuğrul (Frigate)
Japan--Foreign relations--Turkey.
Turkey--Foreign relations--Japan.
Turkey--History, Naval.
Warships--Turkey--History.