oil refinery in Centennial

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HollyFrontier

East Tufts Avenue 8055, 80237 Denver, United States

An independent petroleum refiner in the United States with operations throughout the mid-continent, southwestern and Rocky Mountain regions. Subsidiaries of HollyFrontier produce and market gasol…

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Swan Energy Inc

East Maplewood Avenue 8100, 80111 Greenwood Village, United States