Gwendoline Butler Books

A Grave Coffin: A Commander John Coffin Mystery

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The discovery of the mutilated body of a detective who was doing undercover work on the sale of illegal pharmaceuticals is only the first element in a bizarre investigation facing Commander John Co...

Coffin Knows the Answer

By Gwendoline Butler

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Coffin on the Water

By Gwendoline Butler

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Coffin on Murder Street

By Gwendoline Butler

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Cracking Open a Coffin

By Gwendoline Butler

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A Dark Coffin

By Gwendoline Butler

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Footsteps in the Blood A Charmian Daniels Mystery

By Gwendoline Butler

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The Coffin Tree

By Gwendoline Butler

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Coffin and the Paper Man

By Gwendoline Butler

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Coffin Underground

By Gwendoline Butler

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

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.