The ISBN of The Lost Books of the Odyssey is 978-0-374-19215-0.
ISBN numbers are not related to maths. They are a system of identification for books.
Yes, ISBN numbers are unique identifiers assigned to each edition of a book, helping to distinguish it from other publications.
The ISBN of What Was Lost is 0955138418.
The ISBN of Master of the Books is 9780207200830.
The ISBN of Innocence Lost is 0316067814.
The ISBN of The Lost Hero is 9781423113393.
The ISBN of The Lost Dog is 9781741753394.
The ISBN of Lost Light is 0316154601.
The ISBN of The Lost Thing is 9780734411389.
The ISBN of The Lost Throne is 0141037075.
The ISBN of The Land I Lost is 0064401839.