00257nam a2200097Ia 4500008004000000082001600040100001800056245002600074260004600100300001300146210210b1969   xxu||||| |||| 00| 0 eng d  a320.07 HEAT  aHEATER (D B).  aTeaching of politics.  aLondonbMethuen Educational Limitedc1969  aviii,213