A partial listing of clients that R. G. Johnson has completed work for includes:
- Alliance Resource Partners, L.P.
- Alpha Natural Resources, Inc.
- Arch Coal, Inc.
- CONSOL Energy Inc.
- Dana Mining Company, LLC
- Iron Mountain, Inc.
- Murray Energy Corporation
- National Institute of Safety & Health (NIOSH)
- Patriot Coal Corporation
- Peabody Energy, Inc.
- United States Steel Corporation
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