Columbia subject headings:
Austria--Description and travel.
Balkan Peninsula--Description and travel.
Cairo (Egypt)
Hungary--Description and travel.
Harvard subject headings:
Austria--Description and travel.
Balkan Peninsula--Description and travel.
Cairo (Egypt)--Description and travel.
Hungary--Description and travel
Princeton subject headings:
Austria--Description and travel.
Balkan Peninsula--Description and travel.
Cairo (Egypt)--Description and travel.
Hungary--Description and travel.