Subjects
- UMWA District 6 - Unions.1
- Union names.[remove]43
- Unions - Brotherhood of Railroad Trainmen.1
- Unions - National Miners Union.1
- Unions - Progressive Mine Workers of America.3
- Unions - Teamsters.1
- Unions - UMWA.4
- Unions - United Toy Workers.1
- Unions -- Coal2
- Unions.5
- Unions. SEE ALSO Labor organization.42
- United States - Census returns.1
- United States Bureau of Mines - Inspectors' reports.1
- United States. Labor Management Relations Act, 19474