Subjects
- Coal mining - Labor organization.4
- Coal mining - Mechanization.2
- Coal mining - New River field.1
- Coal mining - Regulation.1
- Coal mining - Safety.1
- Coal mining - Scrip.1
- Coal mining - Wage scales.1
- Coal mining - Winding Gulf field.1
- Coal mining - Working conditions.2
- Coal mining - age affidavits.1
- Coal mining - camps and company towns.1
- Coal mining - coal and coke sales.1
- Coal mining - coal companies.2
- Coal mining - coal operators associations.2
- Coal mining - company stores.2