Columbia subject headings:
Balkan Peninsula--History--War of 1912-1913--Pictorial works.
Postcards--Bulgaria--History.
Harvard subject headings:
Balkan Peninsula--History--War of 1912-1913--Pictorial works.
Postcards--Bulgaria--History.
Princeton subject headings:
Balkan Peninsula--History--War of 1912-1913--Pictorial works.
Mehmet Nail Bey.
Postcards--Bulgaria--History.