SME
American Resources Policy Network
U.S. Dept of the Interior
Office of Surface Mining Reclamation and Enforcement
U.S. Geological Survey Mineral Commodity Summaries (2019 here)
Energy Policy Research Foundation
“The Economic Value of American Coal Exports” August 14, 2012
United States Environmental Protection Agency
Study on the Potential Impacts of Hydraulic Fracturing on Drinking Water Resources Final Report 2016
United States Government Accountability Office
IHS MARKIT
Advancing the Landscape of Clean Energy Innovation 2019
The National Academy of Sciences
Emerging Workforce Trends in the Energy and Mining Industries: A Call to Action (summary)” March 2013