kw.\*:("PERIODE 1967-1975")
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THE DEVELOPMENT OF NIGERIA'S NATURAL GAS: PROSPECTS AND PROBLEMSONWUKA ND.1979; GAS ENGNG MANAG.; GBR; DA. 1979; VOL. 19; NO 7; PP. 401-404; BIBL. 6 REF.Article
WORLD COAL OUTPUT CONTINUES UPWARD TREND.1976; COAL GOLD BASE MINER. SOUTH. AFR.; S. AFR.; DA. 1976; VOL. 24; NO 8; PP. 105-108 (2P.)Article
OL IN ALBANIEN UND BULGARIENPEER VA.1974; ; OEL; DTSCH.; DA. 1974; VOL. 12; NO 8; PP. 230-231Article
DER BERGBAU KUBAS = THE CUBAN MINING INDUSTRY = L'INDUSTRIE MINIERE A CUBAROLAND NW.1980; GLUECKAUF (ESSEN); ISSN 0340-7896; DEU; DA. 1980; VOL. 116; NO 2; PP. 70-75; ABS. ENG/FRE; BIBL. 3 REF.Article
LE DEVELOPPEMENT DE L'INDUSTRIE PETROLIERE A OMAN. = DEVELOPMENT OF OIL INDUSTRY IN OMAN1976; PETROLE GAZ ARABES; LIBAN; DA. 1976; VOL. 8; NO 176; PP. 16-23Article