. "Roald Amundsen"@en . "Free Tank unit."@en . "Steam power, Gunpowder, Metallurgy"@en . "Combustion (CivRev)"@en . "__NOEDITSECTION__ Combustion is one of the first modern Technologies and is a highly useful tech. It unlocks the Tank, a versatile and powerful unit, and unlocks the Oil Resource, providing extra production."@en . "Tank"@en . "Automobile, Flight"@en . "Knight"@en . "__NOEDITSECTION__ Combustion is one of the first modern Technologies and is a highly useful tech. It unlocks the Tank, a versatile and powerful unit, and unlocks the Oil Resource, providing extra production."@en . "Oil"@en .