Matches in DBpedia 2014 for { ?s ?p <http://dbpedia.org/resource/Category:Petroleum> . }
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- Arctic_Challenger subject Category:Petroleum.
- Asphalt subject Category:Petroleum.
- Asphaltene subject Category:Petroleum.
- Barrel_(unit) subject Category:Petroleum.
- Blacktop subject Category:Petroleum.
- California_oil_and_gas_industry subject Category:Petroleum.
- Components_of_crude_oil subject Category:Petroleum.
- Connate_fluids subject Category:Petroleum.
- Crude_oil_assay subject Category:Petroleum.
- Gilsonite subject Category:Petroleum.
- History_of_petroleum subject Category:Petroleum.
- Infrasonic_passive_differential_spectroscopy subject Category:Petroleum.
- International_Petroleum_Exchange subject Category:Petroleum.
- Kerogen subject Category:Petroleum.
- Light_crude_oil subject Category:Petroleum.
- Oil_analysis subject Category:Petroleum.
- Organization_of_Petroleum_Importing_Countries subject Category:Petroleum.
- PONA_number subject Category:Petroleum.
- Petrochemistry subject Category:Petroleum.
- Petroleum subject Category:Petroleum.
- Sour_crude_oil subject Category:Petroleum.
- Sweet_crude_oil subject Category:Petroleum.
- Category:Deaths_caused_by_petroleum_looting broader Category:Petroleum.
- Category:Environmental_issues_with_petroleum broader Category:Petroleum.
- Category:Petroleum_by_country broader Category:Petroleum.
- Category:Petroleum_geology broader Category:Petroleum.
- Category:Petroleum_industry broader Category:Petroleum.
- Category:Petroleum_organizations broader Category:Petroleum.
- Category:Petroleum_products broader Category:Petroleum.
- Category:Unconventional_oil broader Category:Petroleum.
- Category:Works_about_petroleum broader Category:Petroleum.