“Wind-turbine” icon by Daniele Catalanotto,
“Barrel” icon by Arthur Shlain,
“Mining Pick” icon by icon 54,
“Towers” icon by Chris Markhing,
“Tractor” icon by Norbert Kucsera,
“Alarm Clock” icon by Joe Harrison,
“Target Keywords” icon by Ema Dimitrova,
from the Noun Project.