Subjects
- Coal - Mine safety.1
- Coal - company stores.1
- Coal - labor disputes.1
- Coal - labor relations.1
- Coal - problems.1
- Coal Mining - Tug River field1
- Coal mining - Labor organization.1
- Coal mining - New River field.1
- Coal mining - Regulation.1
- Coal mining - Safety.3
- Coal mining - Winding Gulf field.1
- Coal mining - coal and coke sales.1
- Coal mining - coal operators associations.2
- Coal mining -- Strikes1
- Coal mining.3