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A gigantic map of all the cool plaques in the world.

A gigantic map of all the cool plaques in the world. A project of 99% Invisible

Allegheny Arsenal

Allegheny Arsenal

From the Flickr group Historical Markers, photo by sportsedit15224, full page.

License is Attribution-NonCommercial-ShareAlike License
👤 Submitted by Historical Markers 📅 2018-01-24

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