It's crazy," president Mike Wilson said. Last year, The Sage Corp. of Billings set up a special team to train more oil field drivers, including for Canadian-based Sanjel Corp., which recently opened a ...

This story was produced in partnership with the Pulitzer Center. It is part one of a four-part series. Jose Gonzalez* wore no mask, despite the toxic chemicals he worked with in the oil field. “One ...