00255nam a2200109 a 450000500170000008200200001710000170003724500350005425000170008926000210010630000180012720251203091654.0  a620.11,bD, nar  aNarang, B.S.  aMaterial Science and processes  a2nd rev. ed.  aDelhibCBSc1983  aiv,376p, 22cm