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About: Keystone Markers     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : owl:Thing, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

A system of roadside signage developed by the Pennsylvania Department of Highways just after the First World War, the iconic Keystone Markers could be found at the entrance to every Pennsylvania town, borough and city. Variations of the marker could be found at highway crossings of creeks, rivers, trails, borough lines, and other points of interest.