kw.\*:("PERIODE 1951-1975")
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Selection :
COAL CRITIQUE. = CRITIQUE D'UNE ETUDE SUR LE CHARBON1976; COAL GOLD BASE MINER. SOUTH. AFR.; S. AFR.; DA. 1976; VOL. 24; NO 5; PP. 35-49 (6P.); BIBL. 5 REF.Article
LITHIUM AS AN ENERGY RESOURCEHAYASHI H; SHIMOYAMA A.1981; NIPPON KOGYO KAISHI; ISSN 0369-4194; JPN; DA. 1981; VOL. 97; NO 1118; PP. 221-225; ABS. ENG; BIBL. 15 REF.Article
ECONOMICS OF TECHNOLOGICAL CHANGE IN U.S. COAL MINES, 1951-75LAKHANI HG.1980; ENERGY; GBR; DA. 1980; VOL. 5; NO 3; PP. 217-230; BIBL. 13 REF.Article