['graphics/icons/Clean_Air2.png', 'graphics/icons/Seedling.png', 'graphics/icons/Woodpulp_32.png', 'graphics/icons/advanced_fertiliser_32.png', 'graphics/icons/ash.png', 'graphics/icons/charcoal.png', 'graphics/icons/coke-coal.png', 'graphics/icons/crushed-stone.png', 'graphics/icons/fertiliser_32.png']