Columbia subject headings:
Istanbul (Turkey)--Description and travel.
Velichkov, Konstantin, 1855-1907--Travel.
Harvard subject headings:
Istanbul (Turkey)--Description and travel--19th century.
Velichkov, Konstantin, 1855-1907--Travel.
Princeton subject headings:
Istanbul (Turkey)--Description and travel--19th century.
Velichkov, Konstantin, 1855-1907--Travel.