Razlika između inačica stranice »Petrokemija«

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* [http://www.petrochemistry.net/ Petrochemistry in Europe]
* [http://www.icfconsulting.com/ The Emerging Oil Refinery Capacity Crunch]
* [http://www.ProcessEngr.com/ Oil Refinery Processes - Ronald (Ron) F. Colwell]
* [http://www.xperimania.net/ Educational resource on petrochemistry]