Info. re: Oklahoma illegal adoptions, 1960's

I wasn't even really sure where to post this, but it has been bothering me so I thought I would share. When I was a kid, sometime in the mid 80's, I was at my grandparents house and someone called seeking information about an adoption. My mother talked to them on the phone and I overheard part of the call. Mom didn't have much information and was a bit hesitant to share what she did know. I asked about it, and she told me what she knew. When she was a kid, or maybe teenager, my great-grandmother was assisting in illegal adoption. I didn't know the term at the time, but that is what it was. Expecting girls were sent to "Girl's town" in Tecumseh, Oklahoma. My great-grandmother who lived nearby in Shawnee, Oklahoma, and probably others in the community, would have these girls come live with them. I'm sure the benefit of this to my great-grandmother was a live in maid, and to the girl's was that they got to leave "girl's town" which was a low level juvenile detention type facility. Someone, I don't know who, matched the girls with "adoptive" families. When the babies came, the girls were checked into the hospital under the names of the "adoptive" mothers. No adoption record was ever created because the birth certificate recorded the adoptive parents as the biological parents. I don't know if this helps anyone or not, but if anyone specifically knows they were delivered at the hospital in Shawnee, Oklahoma and are struggling to find records this could be the reason.