Subjects
- Coal mining - Labor organization.1
- Coal mining - Mechanization.[remove]3
- Coal mining - Safety.1
- Coal mining - coal companies.1
- Coal mining -- Strikes2
- Engineering1
- Gas industry1
- Labor1
- Petroleum industry and trade1
- Poetry.1
- Political activism.1
- Politics and government.1
- Railroads - Chesapeake and Ohio Railroad.1
- Railroads - Norfolk and Western Railroad.1
- Socialism1