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ZMIANY W SKLADZIE CHEMICZNYM REZPUSZEZALNIKOW OBIEGOWYCH ZACHODZACE W PROCESIE EKSTRAKCJI WEGLA = CHANGES IN THE CHEMICAL COMPOSITION OF CIRCULATORY SOLVENTS DURING COAL EXTRACTION PROCESS = MODIFICATIONS DE LA COMPOSITION CHIMIQUE DES SOLVANTS EN CIRCULATION PENDANT L'EXTRACTION DU CHARBONRUSIN E; POTYKA W; RUSIN A et al.1979; KOKS SMOLA GAZ; POL; DA. 1979; VOL. 24; NO 1; PP. 7-11; ABS. RUS/ENG/FRE/GER; BIBL. 4 REF.Article

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