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Subject
- Dams.[remove]9
- Hydroelectric generators.2
- Spillways.2
- Aquatic sports--United States.1
- Automobiles.1
- Axes.1
- Boats and boating--United States.1
- Building.1
- Canoes and canoeing.1
- Construction workers.1
- Crowds.1
- Dern, George Henry, 1872-1936.1
- Footbridges.1
- Hoover Dam (Ariz. and Nev.)1
- Indians of North America--Montana.1
- Johnson, Hiram, 1866-1945.1
- Locomotives.1
- Lumber trade.1
- Lumber.1
- Lumbermen.1