Terry Crowdy Books

Napoleon s Women Camp Followers

By Terry Crowdy, Christa Hook

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French Napoleonic Infantryman 1803 15

By Terry Crowdy

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French Revolutionary Infantryman 1791 1802 Warrior

By Terry Crowdy

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French Soldier in Egypt 1798 1801

By Terry Crowdy

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French Warship Crews 1789 1805

By Terry Crowdy

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"To gain the upper hand in conflict the ability to know what your enemy is planning is vital. Massive amounts of money have been spent and many lives have been lost in pursuit of this objective. Fr...

Military Misdemeanors

By Terry Crowdy

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The Enemy Within

By Terry Crowdy

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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.