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- ca. 1913-1914✖[remove]97
- Cities--Morgantown--Pietro Collection--Business and Industry--Beaver Falls, PA.72
- Pipelines--Pennsylvania--Beaver Falls--Design and construction.59
- Road construction workers--Pennsylvania--Beaver Falls.47
- Coal Strike, Colo., 1913-1914.22
- Coal Mines and Mining--Strikes--Ludlow Strike,1913-1914--Bittner Collection.21
- Firearms.8
- Roads--Pennsylvania--Beaver Falls--Design and construction.8
- Coal miners--Colorado--Ludlow.5
- Factories--Pennsylvania--Beaver Falls.4
- Flags of truce.4
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