"Sarah B. Cochran probably didn't expect to own businesses that competed with Henry Clay Frick's or to exceed Andrew Carnegie's philanthropic giving in certain circles. But when her husband and son died suddenly, she had to take over the family coal and coke business at a time when it was illegal, and some thought unlucky, for women to work in or around coal mines. Rather than retreating from the world, from her forties through her seventies she engaged...