www.stat.fi/meta/luokitukset/polttoaineet/001-2015/321_en.html
... Top level - Fuel classification 3 Renewable and mixed fuels 32 Other biofuels and mixed fuels 321 Biogas 3211 Landfill gas 3212 Biogas from wastewater treatment plants 3213 Industrial ...
02/10/2015