Donald Harley Books

The Visitors R D

By Donald Harley, Penny Hegarty

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Secrets of Wartime Adventure

By Donald Harley, Gordon Hill

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The Roman Arena Time Tours

By Donald Harley, Mike Smith, Mike Taylor, Andrew Langley

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The Egyptian Tomb Time Tours

By Donald Harley, Mike Smith, Mike Taylor, Andrew Langley

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Classic Dan Dare: The Man From Nowhere

By Frank Hampson With Don Harley

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It’s chocks away and tally-ho once again as Dan Dare, Pilot of the Future, returns! First published in classic British comic Eagle, these are the original adventures of one of the best known...

Thunderbird

By Donald Harley, Brian Edwards Undifferentiated, Edward Thorneycroft

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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.