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- 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
- Bars (Drinking establishments)2
- Coal Mines and Mining--Strikes--Bittner Collection.2
- Dwellings--Pennsylvania--Beaver Falls.2
- Horse-drawn vehicles--Pennsylvania--Beaver Falls.2
- Journalists.2
- Machine guns.2
- Manholes--Pennsylvania--Beaver Falls--Design and construction.2
- Railroad tracks--Pennsylvania--Beaver Falls.2
- Sidewalks--Pennsylvania--Beaver Falls--Design and construction.2
- Tents--Colorado--Ludlow.2
- Children of coal miners--Colorado--Ludlow.1
- Cities--Alderson--Portraits--Group.1
- Coal miners' spouses--Colorado--Ludlow.1
- Coal miners--Labor unions--Colorado--Ludlow.1
- Construction workers--Pennsylvania--Beaver Falls.1
- Cooks.1
- Counties--Pendleton--Schools.1
- Funeral rites and ceremonies--Colorado--Trinidad.1
- Roads, Brick--Pennsylvania--Beaver Falls--Design and construction.1
- Soldiers--Colorado--Ludlow.1
- Storage facilities--Pennsylvania--Beaver Falls.1
- Streets--Pennsylvania--Beaver Falls--Design and construction.1
- Students--West Virginia--Alderson.1
- Teachers--West Virginia--Pendleton County.1