Subject
- Landscape photography44
- Middle East--Historical geography44
- Architecture -- Bulgaria33
- Clothing and dress -- Bulgaria33
- Ethnic costume -- Bulgaria33
- Ethnology -- Bulgaria33
- Landscapes -- Bulgaria33
- Marriage customs and rites -- Bulgaria33
- Material culture -- Bulgaria33
- Pottery -- Bulgaria33
- Christianity22
- History17
- Education16
- Women15
- Children14
- Military14
- Missionary work14
- Portraits14
- Customs and traditions13
- Evangelicalism13