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Oil and Natural Gas Corporation Oil Rush Oil City, Pennsylvania Oil Trough, Arkansas Oilton, Texas Oilinyphia Oileus rimator Oilinyphia peculiaris Oileus heros OileidesTài liệu tham khảo
WikiPedia: Oil City, Pennsylvania http://factfinder2.census.gov/faces/tableservices/... http://www.census.gov/geo/www/gazetteer/gazetteer2...