I still have no idea who my father is ... grandma won't talk about it ... she thinks it's her fault for having my mother. My mother won't talk about it ... she's pathological and probably believes the lies she's told. Stepdad won't talk about it ... he's terrified of his wife (my mom). I found out from his bother ... but they don't know the whole story.
The knowledge has cleared up a lot of mysteries for me ... but has left the biggest one ... who is my dad? I am so happy for you that you have your daughter. I'm so glad you accepted her so completely ... it gives me hope.
Don't give up, hopefully he is alive, well and a good guy.
The internet was the final difference in our case. There was no WWW when she started. Of course she actually had some help from her Mom and you may not until she gets sick and tired of you pestering her.
There are websites dedicated to people finding people and you have some clues you can use...your date of birth, where you would have been conceived, you mom's first name and her description at the time, her occupation at the time etc.
Keep in mind that old saying though, be careful what you wish for, finding out could be worse than not knowing...I'm not being cynical...just be braced. I mean maybe he's Bill Klinton!