00261nam a2200109Ia 4500008004100000082001600041100001600057245002600073260002700099300001100126650001400137240817s9999    xx            000 0 und d  a668.413 F48  aSipher,E.G. 0aExtrusion of Plastics  c1964a Londonb Iliffe  a271 p.  a Plastics