00275 a2200109 4500020001500000082001800015100001800033245003600051260004300087300001600130650001900146 a0863189040 a333.7932bPAR aParker, Steve aElectricitybeyewitness science aLondonbDorling Kindersleyc1992g1992 a64pc27.5cm aLAND ECONOMICS