File:Path of Progress, national heritage tour route. Heritage trails, southwestern Pennsylvania - Pennsylvania memories last a lifetime. LOC 96687535.jpg
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![File:Path of Progress, national heritage tour route. Heritage trails, southwestern Pennsylvania - Pennsylvania memories last a lifetime. LOC 96687535.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Path_of_Progress%2C_national_heritage_tour_route._Heritage_trails%2C_southwestern_Pennsylvania_-_Pennsylvania_memories_last_a_lifetime._LOC_96687535.jpg/398px-Path_of_Progress%2C_national_heritage_tour_route._Heritage_trails%2C_southwestern_Pennsylvania_-_Pennsylvania_memories_last_a_lifetime._LOC_96687535.jpg?20180602152713)
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