00345nam a2200133Ia 4500008004100000020000500041082002100046100002000067245003900087260004300126300000700169650001800176650001700194140316s9999    xx            000 0 und d  a  a333.7915bCOL/EN  acolombo,Umberto  aEnergy and sustainable development  abTata energy research institutec1998  a43  aCoal deposits  aoil reserves