Pennsylvania Historical and Museum Commission Approves 23 New State Historical Markers – PR Newswire (press release)

Pennsylvania Historical and Museum Commission Approves 23 New State Historical Markers
PR Newswire (press release)
A segment of a Davies & Thomas PA Railroad tunnel was on display at the St. Louis Worlds' Fair. … The process also led to the formation of the nation's first workers' union in the metals industry, the Sons of Vulcan, the precursor of the United

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