Richardson, Douglas Books

An illustrated guide to the techniques and equipment of electronic warfare

By Doug Richardson

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Plantagenet ancestry

By Richardson Douglas

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Plantagenet Ancestry: A Study In Colonial And Medieval Families, Vol. 1

By Douglas Richardson, Richardson, Douglas

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"This book documents lines of descent for approximately 190 seventeenth-century North American colonists from the Plantagenet dynasty that ruled England from 1154 to 1485. This dynasty was founded...

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.