VOLUME 20 (4)/August 1990

Department of Mineralogy, Petrology & Economic Geology, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece
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Department of Mineralogy, Petrology & Economic Geology, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece
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Department of Mineralogy, Petrology & Economic Geology, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Geological lnstitute, Bulgarian Academy of Sciences, 1113 Sofia
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Geological lnstitute, Bulgarian Academy of Sciences, 1113 Sofia

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Higher lnstitur of Mining and Geology, Sofia 1156
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Enterprise for Geological Exploration, Sofia
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Enterprise for Geological Exploration, Sofia

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria