Topical Subjects
- Coal mines and mining--West Virginia--Thomas.1
- Coal mines and mining--West Virginia--Watson.1
- Coal preparation plants--Pennsylvania--Pittsburgh.1
- Coal preparation plants--Virginia--Boissevain.1
- Coal preparation plants--West Virginia--Covel.1
- Coal preparation plants--West Virginia--Farmington.1
- Coal preparation plants--West Virginia--Jenkinjones.1
- Coal preparation plants--West Virginia--McComas.1
- Coal preparation plants--West Virginia--Middleton.1
- Coal preparation plants--West Virginia--Pursglove.1
- Coal preparation plants--West Virginia--Vivian.1
- Coal trade--Accidents.1
- Coal trade--Exhibitions.1
- Coal trade--Quality control.1
- Coal--Awards.1
- Coal--Transportation--Bartley.1
- Coal--Transportation--New Jersey--South Amboy.1
- Coal--Transportation--Ohio--Cadiz.1
- Coal--Transportation--Pennsylvania.1
- Coal--Transportation--West Virginia--Covel.1