000 00261nam a2200109 4500
999 _c7496
_d7496
082 _a533.5DUR
100 _aDurrani, I.R.
245 _aThe Structure of Vacum a Treatise
260 _aIslamabad:
_bNational Book Foundation,
_c1996.
300 _a69p. ;
942 _cBK