International Standard Book Number in 1965, has – 340 indicating the publisher, 01381 their serial number, and 8 being the check digit. This can be converted to ; the check digit does not need to be re-calculated. Since 1 January 2007, ISBNs have contained 13 digits, a format that is compatible with "Bookland" European Article Number EAN-13s. An ISBN is assigned to each edition and variation (except reprintings) of a book. For example, an ebook, a paperback, and a hardcover edition of the same book would each have a different ISBN. The ISBN is 13 digits long if assigned on or after 1 January
Number 13 (short story) While talking, the protagonist and the inn-keep hear ominous singing in the room next door. They check Number 14, but learn that its occupant thought it was them, then they find the "nonexistent" door to Number 13. A clawed hand attacks them, and they attempt to break down the door but break through the plaster wall. The occupants of 12 and 14 spend the night in a double bedded room. The narrator meets his cousin a few months later, and relates the tale to him. Number 13 (short story) "Number 13" is a ghost story by British writer M. R.