I am an Author, i launched my first book in October 2016.
I am preparing to launch my second book in the last quarter of the year and it is mandated for me to obtain an ISBN.
It only took me less than 2 hours to obtain an ISBN for my first book at The National Library of Nigeria, last year.
To my surprise when i got to same office this afternoon to process and acquire an ISBN for my new book, i was told that ISBN has finished this morning, and that i should come back by next week.
Please, i need learned people to enlighten me on ISBN, because i was wondering why serial numbers that are automatically generated can get exhausted...

cc
lalasticlala
mynd