Gary J. Cook Books

The secret land
The secret land

By Gary J. Cook

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A murder of wolves
A murder of wolves

By Gary J. Cook

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Undercover sheriff's deputies Joe Big Snake Person and James Longstreet Lambier find themselves in danger as they begin to realize they are being used as pawns in a power struggle between factions...

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Lonewalker
Lonewalker

By Gary J. Cook

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Clinical Nuclear Medicine

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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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