Peter Hertzog Books

Old Town Albuquerque: A History Of The Ancient Town At The Crossroads Of The American Southwest

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For almost three centuries, Old Town, Albuquerque, has been the crossroads of the American Southwest. This book gives a concise history of events that shaped this unusual villa that was first settl...

Outlaws Of New Mexico, A Compilation

By Unknown, Peter Hertzog

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The Rough Guide to the USA Make the most of your time on Earth with the ultimate travel guides. Discover the USA with this comprehensive and entertaining travel guide, packed with practical informa...

Old Town Albuquerque 1706 1964

By Peter Hertzog

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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.