John Altman Books

A Gathering of Spies

By John Altman, Altman John

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Deception

By John Altman, Altman John

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The Watchmen

By John Altman, Altman John

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Art of the Devil The A plot to assassinate President Eisenhower

By John Altman

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Having completed her mission to silence an agency defector, CIA operative Cassie Bradbury finds herself cut adrift in Moscow with no documents, no tickets and no identification. Hot on her trail ar...

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.