00251nam a2200121Ia 4500100001900000250000600019654001300025245002300038260003100061082001700092300000800109546001200117  aBrydson/ J.A.   a2  aPlastics  aPlastics materials  bNewnes- Butterworthsc1975  a620.112bBRY  a729  aENGLISH