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Frank WakefieldTed has told you correctly, and you need to download and print Scott's work.
I think that back in the 70s, and before, regional cards were still found regionally. But not so afterward.
Before WW II, folks didn't move much. Nowadays folks move every 2 years, on average. WW II railroaded folks all over the US... and folks were more likely to marry someone 'away' from home. Before WW II cards hardly moved geographically at all.
By the 70s, folks moved around... many of the 'original' collectors of T206 had passed away, moving the cards into the hands of a later generation. So cards were moving because of that.
Plus, the old cards were moving because of heightened collector interest. Collectors would advertise, seeking cards. They would shop around.
The modern 'homogenizer' is eBay... Today, we mail cards all over creation. I have about 100 ZeeNuts, I guarantee you they weren't in candy sold back here in Kentucky.
While I think it is possible to find a small group of regional cards in some backwoods antique mall... it is no longer likely. Folks get on the internet and try to figure out what they have. Yet I still fantasize about driving back roads down to New Orleans, stopping in Louisiana at a small antique store, and finding a box that has a few dozen Kotton cards, and a couple of dozen "undiscovered" T206s, southern league players with Hindu backs... maybe 4 or 5 Jackson, New Orleans... I could keep one, sell two, and trade two. Might only trade one, and give the other to Ted Z.