Gwyn Headley Books

Follies

By Gwyn Headley, G. Headley

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London: Sight Unseen: A Personal View of London

By Inc. Sterling Publishing Co., Antony Armstrong Jones Earl Of Snowdon

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More than mere curiosities, all of the architecture follies described in this illustrated guide are masterpieces in their own right. Each is the incarnation of its creator's singular passion, vanit...

Mah Jong Know the Game

By Gwyn Headley, Yvonne Seeley

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Mah Jong Know the Game

By Gwyn Headley, Yvonne Seeley

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Mah Jong Know the Game

By Gwyn Headley, Yvonne Seeley

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Mah Jong

By Gwyn Headley, Yvonne Seeley

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An Architectural Vocabulary

By Gwyn Headley

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Fabulous Fonts Knowledge Cards

By Gwyn Headley

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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.