00388    a2200121   4500020001500000082001500015100002500030245011800055260004400173300001600217650001200233650002100245  a033516207X  a530.4bOPE  aThe Open university   aThe physics of matterbunits 12 and 13 electrical properties of solids,unit 14 block 3 revision and consolidation  aKeynesbThe Open Universityc1993g1993  a128p.c29cm  aPhysics  aStates of matter