00358nam a2200121Ia 4500008004000000020001800040082001700058100002700075245005300102260004200155300000800197650003100205210210b1991   xxu||||| |||| 00| 0 eng d  a81 207 0068 6  a500.207 GUPT  aGUPTA (Sharwan Kumar).  aTeaching physical sciences in secondary schools.  aNDbSterling Publishers Pvt Ltdc1991  a232  aTeaching physical sciences