What is 13-digit library info?
There are two possible answers this question:It may refer to the International Standard Book Number(ISBN), which consists of a unique set of 13 digits, as well as a barcode. The ISBN was developed specifically for booksellers; each and every book title that's published is given it's own ISBN.It may refer to a user's library barcode number, which is typically found on a user's library card. Different libraries have different number schemes to differentiate between users: some may use a 13-digit number, while others may use a smaller or larger set of numbers (e.g. 7 digits, 14 digits, 16 digits, etc).