Mary Kelley is the author of Coal in Campbell County, a book that traces the lineage of each of Gillette’s major coal companies in the area. It’s her second book about the coal industry in Gillette. She and her husband both worked for the AMAX coal company for many years. Kelley told Wyoming Public Radio’s Irina Zhorov that she wanted to preserve the history of the coal companies, but also show how they helped create a good life for people like her in Campbell County.