Columbia subject headings:
Balkan Peninsula--History--War of 1912-1913--Pictorial works.
Balkan Peninsula--Pictorial works.
Filov, Bogdan, 1883-1945--Travel--Balkan Peninsula--Pictorial works.
Harvard subject headings:
Archaeologists--Bulgaria.
Balkan Peninsula--Description and travel.
Balkan Peninsula--History--War of 1912-1913.
Bulgaria--Description and travel.
Cabinet officers--Bulgaria.
Filov, Bogdan, 1883-1945--Diaries.
Filov, Bogdan, 1883-1945--Travel--Balkan Peninsula.
Greece--Description and travel.
Thrace--Description and travel.
Turkey--Description and travel.
Princeton subject headings:
Balkan Peninsula--Description and travel--Pictorial works.
Balkan Peninsula--History--War of 1912-1913--Pictorial works.
Filov, Bogdan, 1883-1945--Travel--Balkan Peninsula--Pictorial works.