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Publisher
- Gfk MACON Company21
- Platts10
- Central Intelligence Agency4
- GfK GeoMarketing GmbH3
- University of California, Berkeley. Museum of Vertebrate Zoology3
- ESRI2
- Committee of Geology, Bulgarian Geological Society, Geological Institute--Bulgarian Academy of Sciences,1
- D. Štúr's Geological Institute,1
- Geological Society of America,1
- International Heat Flow Commission1
- Sofia 1606 (34 General Totleben bulv.) : Military Geographic Service of Bulgarian Armed Forces, 2004-2007.1
- United Nations. Office for Disaster Risk Reduction1
- [Washington, D.C. : Central Intelligence Agency], 19721