EMMAUS, Pa. - Kelly Bower started as a teacher, but became a librarian. She recently came across a good teaching moment at the Emmaus High School Library.

"This is the most extreme example of bringing a book back," Bower said. "We haven't seen this book in over 41 years."

The book, "Bob Dylan," was checked out on May 8th, 1978. School staff say the man who turned in the book last week found it cleaning a parent's home.

"According to office staff, the man swears up and down, he did not check out the book," Bower said.

Who really checked it out? As Dylan might say, "it's a complete unknown."