tehdas, voimalaitos, ala, polttoaineen ja sähköntuotantoon, saastuminen, ympäristö, tekniikka, savupiippu, fossiilisia polttoaineita, jalostamo, Rakennusteollisuus Ilmainen lataus
Lataus alkaa pian
Asiaankuuluvat rojaltivapaat valokuvat
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