Mac Tonnies Books

Illuminated black and other adventures

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Darklore Volume II

By Mike Jay, The Emperor, Paul Devereux, Mac Tonnies, Stephen E. Braude, Regan Lee, Michael Tymn, Blair MacKenzie Blake, Nick Redfern, Filip Coppens, Jonathan Downes, Greg Taylor, Theo Paijmans, Michael Prescott, Neil Arnold

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Darklore is a journal of exceptional observations, hidden history, the paranormal and esoteric science. Bringing together some of the top researchers and writers on topics from outside of mainstrea...

After the Martian apocalypse

By Mac Tonnies

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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.