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Comparative investigations on Gagate and Vitrain from the Balkan coal basin
R. Petrova, D. Minčev, Zdr. NikolovVolume:
5
Year:
1985
Language:
english
Pages:
6
DOI:
10.1016/0166-5162(85)90029-1
File:
PDF, 321 KB
english, 1985