S. Roger Keller Books

Events of the Civil War in Washington County, Maryland

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The Civil War transformed the Potomac River into an international boundary, placing Washington County on a dangerous border. The valley, located at the mid-point of a natural corridor, appeared to...

Crossroads of war

By S. Roger Keller

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Riding With Rosser

By Thomas Lafayette Rosser, S. Roger Keller

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Riding with Rosser is General Thomas L. Rosser's personal account of the war, in which he was wounded nine times! Here is the American Civil War as viewed by one of the Confederacy's most competent...

Isaac Shelby

By S. Roger Keller

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"A native of Maryland and later resident of the Carolinas, Isaac Shelby fought in three wars: Lord Dunmore's, the American Revolution, and the War of 1812. After leading Kentucky to statehood he se...

Roster of Civil War soldiers from Washington County Maryland

By S. Roger Keller

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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.