Columbia subject headings:
Europe--Description and travel.
Istanbul (Turkey)--Description and travel.
Nauplion (Greece)--Description and travel.
Saint Petersburg (Russia)--Description and travel.
Harvard subject headings:
Europe--Description and travel.
Istanbul (Turkey)--Description and travel.
Nauplion (Greece)--Description and travel.
Saint Petersburg (Russia)--Description and travel.
Princeton subject headings:
Europe--Description and travel.
Istanbul (Turkey)--Description and travel.
Nauplion (Greece)--Description and travel.
Saint Petersburg (Russia)--Description and travel.