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- [24] APPLICATION OF EARTH PHOTOGRAMMETRY FOR PHOTOGRAPHING MONUMENTS OF CULTURAL AND ARCHITECTURAL INTEREST IN PEOPLES-REPUBLIC-OF-BULGARIA PHOTOGRAMMETRIA, 1975, 30 (3-6): : 241 - 247
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- [26] ANTI-CORROSIVE STUDIES OF THE TECHNICAL EQUIPMENT OF PETROLEUM DEPOSITS IN THE PEOPLES-REPUBLIC-OF-BULGARIA ZEITSCHRIFT FUR ANGEWANDTE GEOLOGIE, 1980, 26 (03): : 158 - 160
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