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.

Longknives

By John Langellier, Kurt Hamilton Cox

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A history of the cavalry troops of the United States Army focusing on the uniforms and equipment which distinguished them.

Billy Yank

By Michael J. McAfee, John Langellier

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Describes the uniforms worn by members of the Union Army during the Civil War.

Redlegs

By J. Phillip Langellier, John Langellier

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A history of the artillery of the United States Army from 1861 to 1898 focusing on its uniforms and equipment.

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.