John Ryan Books

The Saga of the Three Companeros Pantera Leo and el Tigre
Clifford Algebras and Their Applications in Mathematical Physics
Clifford Algebras and their Applications in Mathematical Physics
The Sound of Falling Snow
The Sound of Falling Snow

By John Ryan

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Lonely Planet Micronations
Pugwash the smuggler
Pugwash the smuggler

By Ryan John

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Captain Pugwash is commissioned to smuggle barrels of brandy overseas, but his quick-witted cabin boy Tom suspects foul play by the captain's nemesis, Cut-throat Jake.

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Irish Monasticism Celtic Studies
Irish Monasticism
Irish Monasticism

By John S. J. Ryan, Ryan John

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Feil-sgribhinn Eoin Mhic Neill
Feil-sgribhinn Eoin Mhic Neill

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Captain Pugwash Cover to Cover
Captain Pugwash Cover to Cover

By John Ryan

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If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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