(AP) — A man who was abandoned in a phone booth in Kansas City, Kan., in 1972 is on a quest to identify his birth parents and why they left him.

Bill Atkinson, who now lives in suburban St. Louis, was found covered in nothing but a blanket in the phone booth on June 7, 1972. Doctors thought he was about 12 hours old when he was found.

Now a 41-year-old husband and father of three, Atkinson says the couple who adopted him gave him a great life. But he says having his own children has made him interested in finding out about his origins.

The investigation has proven difficult. Many of those involved in his discovery are dead and there are few clues from records.