agency responsibility

I relinquished 20 years ago. The long and short of it is that I finally got my non identifying information from that agency. There isn't anything to speak of. A couple of notes about me, 20 or 30 pages on the adoptive family (which of course I do not want to look at) and the one sheet of paper I filled out about myself. I am so frustrated, it seems if the agency is getting MY CHILD the least they could do would be to keep some paperwork on how I arrived at the decision. The few notes that were in the file suggested that I wasn't to keen on the idea. It's been 20 years and I would like to know more about what happenned to me back then. I have never thought of myself as a victim, but as my memory on this slowly returns, I realize the only way I was able to let that baby boy go was through a lot of deception on the part of the agency and people around me. This is a long way of asking what is the agency required to keep in the way of records on the birth mother? shouldnt they at least have medical records? I guess I shouldn't be suprised coming from people who never again contacted me after the paperwork was signed, after all I wasn't what they were after.