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Dear Ms. Shillings,
Thank you for posting your request on History Hub!
While it will be difficult to find Black Market Adoption records for your grandfather, we suggest that you try to determine if any legal adoption papers were filed with the state or court system where he was born. We further suggest that you search this website https://ancestralfindings.com/adoption-records/ for tips on how to find his adoption records as a next step.
We hope this is helpful. Best of luck with your family research!