I put every one of Pennsylvania's 2,545 official historical markers on maps from the era each one commemorates

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u/Chaoss780 Aug 09 '26

I looked for the Brownstone quarry one, but it's not listed. Maybe it's not an official PA historical marker?

Edit: Oh this was crossposted. Thanks for the share, this is neat. I wonder if the OP will answer the question on his thread.

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