Margaret R. O Leary Books

The story of Captain Bud Sophian, the only US Army officer who did not flee Graignes, France, as the Waffen SS overran the American positions and stormed the village. Sophian was a surgeon, and he...

Tragedy at Graignes

By Margaret R. O Leary

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The story of Captain Bud Sophian, the only US Army officer who did not flee Graignes, France, as the Waffen SS overran the American positions and stormed the village. Sophian was a surgeon, and he...

Dr. Thomas Addison (1795-1860)

By Margaret R. O Leary

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Dr. Thomas Addison 1795 1860

By Margaret R. O Leary

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The English Professor

By Margaret R. O Leary, Dennis S. O Leary

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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.