Põhiliste plastide leiutamine ja ajalugu
(Foto) http://www.chm.bris.ac.uk/webprojects2001/esser/history.html
(Alla laetud 30.10.2011.)
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[34] Polüuretaan (PUR) isolatsioonimaterjalina. Eesti isolatsioonitootjate liit.
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