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668.4236 T538p 1984 : Titow, W. V.
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668.4237 So21p 1994 : Society of Plastics Engineers.
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668.4237 W519p : Wessling, Ritchie A.
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668.4239 H41p 1992 : Hepburn, C.
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668.4239 Io6c 2005 : Ionescu, Mihail.
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