A book checked out from a southwest Missouri library 37 years ago is back after the borrower deposited it into an outdoor book drop with an apology note and $6 to cover late fees.

The Springfield News-Leader reports the book, which ponders whether the Bermuda Triangle exists, was due back November 29th, 1978, but didn’t make it back to the library until this week.

The anonymous borrower’s note simply says, “sorry this is so late.”

Springfield-Greene County Library District spokeswoman Kathleen O’Dell says it’s the most overdue return that current employees can recall.

Technically the borrower overpaid because the district’s maximum fine for late-but-returned books is $5.

The 1976 book likely won’t go back on the library’s shelves because of its age.