You might want to start with the following:
State Adoption Laws -
Also, you should put a listing in the registry if you have not done so already.
Adoption Registry - Records, Reunion Registries, Adoptees, Search, Reunite, Birth Mother, Father, Pa
Not everyone reads the forum. This should increase your chances in finding them!!!
If you do come up with some more information I could help you find them..
Good Luck
Tom