Subject
- Portrait photography4,934
- Bulgaria--History4,811
- Ethnographic heritage4,811
- First World War (1914-1918)1,664
- Photography, Military1,362
- Photography1,136
- Christianity1,092
- Postcards806
- Evangelicalism673
- Protestantism565
- History415
- Portraits399
- Missionary work345
- Women342
- Rites and Ceremonies238
- Children231
- Customs and traditions231
- Roma231
- Romanies -- Bulgaria231
- Marriage211