topic

• Military personnel3
• World War, 1914-19183
• Government officials1
• Military officers1

name

• Paul Hoffmann & Co. (Berlin)4
• Boris III, Czar of Bulgaria, 1894-19431
• Ferdinand I, Czar of Bulgaria, 1861-19481

collection

• German World War I photographic postcards4

place

• Albania1
• Germany1
• Serbia1

genre

• Photographs4
• Postcards4

publisher

division

• Wallach Division: Photography Collection4

type

• still image4
• text4