John Langellier Books

A history of the United States Army during the time it served as the vanguard of western expansion and a description of its uniforms and equipment in the late nineteenth century.

Sound the charge

By John Langellier

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A history of the United States Cavalry in the American West throughout the nineteenth and twentieth centuries focusing on its uniforms and equipment.

Fix Bayonets

By John Langellier

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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.