Fossil Fuel (Crude/Raw.Conventional/Unconventional Oil - Petroleum - Natural Gas Methane Ethane - Coal Anthracite Bituminous Sub-Bituminous Coal Lignite) https://oilprice.com/Energy/Energy-General/The-Complete-History-Of-Fossil-Fuels.html https://oilprice.com/Energy/Energy-General/The-Complete-Guide-To-Fossil-Fuels.html