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Subject
- Construction workers--United States.[remove]4
- Cement.1
- Construction + architecture.1
- Cranes, derricks, etc.1
- Dams--Design and construction.1
- Dynamite.1
- Engineering.1
- Explosions.1
- Machinery.1
- Portuguese language.1
- Roads--United States--History.1
- Steel I-beams.1
- Steel industry and trade.1
- White House (Washington, D.C.)1
- Wrecking.1