Data for these maps were compiled and processed by researchers at the West Virginia University Regional Research Institute. The three measures—dependence, impact, and risk—are the same as those found in ARC’s 2018 report, An Economic Analysis of the Appalachian Coal Industry Ecosystem. Data included here are through 2019; the original report included data through 2015. To learn more about the methodology and how to interpret each of these three variables, please refer to that original report.