Bulletin Geological Institute Bulgarian Academy of Sciences
Uitgaven: Series Geochemistry, Mineralogy and Petrography 16. 1967 - 23. 1973;Series Geotechnics, Stratigraphy and Lythography 16. 1967 - 17. 1968;Series Paleontology 16. 1967 - 23. 1974;Series Geotechnics 16. 1970 - 23. 1974;Series Stratigraphy and Lithography 18. 1969 - 23. 1974;Series of Applied Geophysics 18. 1969 - 21. 1972;Series Petroleum and Coal Geology 18. 1969 - ...
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