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Names
- M.E. Grenander Department of Special Collections & Archives3
- Amalgamated Sheet Metal Workers; international alliance1
- International Compressed Air and Foundation Workers Union1
- International Hod Carriers' and Building Laborers' Union of America1
- International Union of Pavers, Rammemen, Flag Layers, Bridge and Curb Setters and Sheet Asphalt Pavers1
- Poor and Company1
- Portec Corporation, Railway Products Division1
- Portec Rail Products, Inc.1
- Rail Joint Company1
- Sheet Metal Workers' International Association1
- The Laborers' International Union of North America1
- Tin, Sheet Iron and Cornice Worker's International Association1
- Tunnel and Subway Constructors International Union1
- United Steelworkers of America (USWA) AFL-CIO-CLC1