00338nam a2200145Ia 4500008003600000041000800036082001100044100001900055245002100074260003400095300001000129650001000139650001200149700003100161210210b   xxu||||| |||| 00| 0 eng d  aeng  a531/32  aCLARK (John A)  aPhysics of today  aLondonbConstable & Co Ltd.c  av,653  atoday  aPhysics  aGORTON (Frederick Russell)