Dan Marzollo Books

I Spy a Rocket Ship I Spy Library
I Spy a Circus I Spy Library
I Spy a Runaway Robot I Spy Library
I spy a circus
I spy a circus

By Dan Marzollo

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Characters locate a variety of hidden objects as they make a toy circus.

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Le champion de hockey
Le champion de hockey

By Jean Marzollo

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Baseball Brothers
Baseball Brothers

By Jean Marzollo

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I Spy Pirate Treasure I Spy Library
I Spy Love
Baseball Brothers

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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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