| (subclass FossilFuel Fuel) | Mid-level-ontology.kif 1680-1680 | |
| (subclass FossilFuel PetroleumProduct) | Mid-level-ontology.kif 1681-1681 | |
| (subclass LiquefiedPetroleumGas FossilFuel) | Mid-level-ontology.kif 1698-1698 | |
| (subclass Gasoline FossilFuel) | Mid-level-ontology.kif 1702-1702 | |
| (subclass DieselFuel FossilFuel) | Mid-level-ontology.kif 1707-1707 | |
| (subclass Coal FossilFuel) | Geography.kif 2018-2018 |
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