David Jefferis Books

Discusses various kinds of machines which can perform some human or animal tasks, including space voyager robots, fantasy robots, and robot warriors. Includes glossary.

Trail bikes

By David Jefferis

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Examines the operation of motorcycles, particularly off-road trailbikes, and describes motocross racing and other events.

Military planes

By David Jefferis

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Text and illustrations describe the flight characteristics and performance capabilities of fighter planes, bombers, transports, and other military aircraft.

Flags

By David Jefferis

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An introduction to the history and uses of flags. Includes illustrations of national, international, signal, and motor racing flags.

Lasers

By David Jefferis

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Describes the characteristics of lasers, how they work, and their many uses.

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.