Columbia subject headings:
Balkan Peninsula--Description and travel.
Eastern question (Balkan)
Hungary--Description and travel.
Turkey--Description and travel.
Harvard subject headings:
Balkan Peninsula--Description and travel.
Eastern question (Balkan)
Hungary--Description and travel
Turkey--Description and travel.
Princeton subject headings:
Balkan Peninsula--Description and travel.
Eastern question (Balkan)
Europe--Description and travel.
Hungary--Description and travel.
Turkey.