Article Photos: By the numbers: U.S. petroleum refinery fatalities

Two workers were killed by a boileThe Wynnewood Refinery where a Sept. 28 boiler explosion killed two workers. <strong>STEVE SISNEY - THE OKLAHOMAN</strong>

Two workers were killed by a boileThe Wynnewood Refinery where a Sept. 28 boiler explosion killed two workers. STEVE SISNEY - THE OKLAHOMAN