John Speirs Books

John Speir s Puzzle Masters Ghostly Games

By John Speirs

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Puzzle Masters The Great Funfair Caper

By John Spiers

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A series of picture puzzles in which the reader helps three young Puzzle Masters and their dog search for hidden treasure while dealing with tunnels, caves, forged treasures and maps, a maze, and o...

Safari for the tigrus

By John Speirs

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A series of picture puzzles in which the reader helps three young Puzzle Masters and their dog search for unusual animals, lost objects, and the mysterious tigrus.

The underground and alternative press in Britain

By John Speirs

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Medieval English Poetry the Non Chaucerian Tradition

By John Speirs

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The Night Before Christmas

By John Speirs, Clement Clarke Moore

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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.