Do You Need Help In Washington State Tacoma Area

I am interested in getting more information how to get information on adoptions back in 1965. I was adopted in Tacoma, WA and the file is closed. I don't have any info on birthparents names, ages, medical history or nationality. It must have been a private adoption since I found out there was an attorney involved. Unfortunately I don't have a name. I know the doctor's name that delivered me, yet he didn't keep any records. How can I get the birth certificate opened, and how do I proceed from there? Any help is much appreciated! Holly