John Nicholas Books

Discusses the various types of rockets and missiles used by the United States Army during different times in history, including early missiles, long-range rockets, and modern weapons.

Artillery (The Army Library)

By Nicholas John

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Describes the various types of artillery used by the United States Army during different times in history, including self-propelled howitzers, light artillery, towed heavyweights, and other kinds o...

Main battle tanks

By Nicholas John

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Explores the different kinds of tanks and their military uses by various countries.

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.