Norman Polmar Books

Ship of Gold

By Thomas B. Allen

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Ship of gold

By Thomas B. Allen

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World Combat Aircraft Directory

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Spy Book

By Norman Polmar

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Spy Book, 2nd Edition

By Thomas Allen, Norman Polmar

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"Unmatched in its breadth and accessibility, Spy Book, 2nd edition is the definitive reference to the secret world of dead drops, code names, double agents, and black projects. With access to previ...

Merchants of Treason

By Norman Polmar

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World War II, America at War 1941-1945

By Norman Polmar, Thomas B. Allen

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DEFCON 2

By Norman Polmar, John D. Gresham

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World War II

By Norman Polmar

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World War II

By Norman Polmar

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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.