00305nam a2200085Ia 4500008004100000082001600041245011600057260002700173700001900200220204s9999    xx            000 0 und d  a662.65bGRE 0aFuture coal supply for the world energy balance: Third IIASA conference on energy resources, Nov 28-Dec 2, 1977  aOxfordbPergamonc1979  aGrenon, Michel