A high school librarian in Phoenix says a former student returned two overdue books checked out 51 years ago along with a $1,000 money order to cover the fines.

Camelback High School librarian Georgette Bordine says the two Audubon Society books checked out in 1959 and the money order were sent by someone who wanted to remain anonymous.

Bordine says the letter explained that the borrower's family had to move to another state and the books were mistakenly packed.

The letter explained the money order was to cover fines of 2 cents per day. That would total about $745. The letter says the extra money was added in case the rates had changed.

Bordine says the money will be used to buy more books.

She says the overdue books will be returned to the shelves.