kw.\*:("PERIODE 1957-1978")
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LES ASPECTS JURIDIQUES DE LA DISTRIBUTION DES GPL = JURIDICAL ASPECTS OF LPG DELIVERYCALERS JC.1980; INDUSTR. DU PETROLE; FRA; DA. 1980; VOL. 45; NO 516; PP. 47-53; (6 P.)Article
DIE NEUE ROLLE DER STEINKOHLE = COAL'S NEW ROLE = LE NOUVEAU ROLE DU CHARBONBUND K.1979; GLUECKAUF (ESSEN); ISSN 0340-7896; DEU; DA. 1979; VOL. 115; NO 23; PP. 1132-1138Article
FRG PLANS MORE USE OF HARD COALBUND K.1979; WORLD COAL; USA; DA. 1979; VOL. 5; NO 11; PP. 54-55Article