PLUMs in southeast Indiana ?????

Damson Plums
Many years ago my Ex-in-laws lived on a place where they had 2 or 3 Damson Plum trees. They got tons of very small plums each year that were mostly seed.
My dear Ex-MIL made wonderful Plum jelly and jam from those Damson plums.
I think they might just be a variety of wild Plum, but I'm not sure.
They never gave those trees any attention, except to pick the plums each year.
The plums were kinda tart, but good.

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There is a local family that collects and raises many different varieties of wild plums to use for making jam, wine, etc...

Unfortunately, I think they may be going out of business. I will try and check into it and see if they may be willing to sell some scions off their stock.