Andrew Helfer Books

Darkwing Duck

By Andrew Helfer

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Batman Forever

By Andrew Helfer

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Indiana Jones and the Cup of the Vampire

By Andrew Helfer

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Eternal Life or instant death? It all depends on whether you and Indiana Jones can find the priceless goblet in Dracula's grave. The reader makes the decisions.

I.JONES CUP VAMPIR Find Your Fate

By Andrew Helfer

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Super Powers

By Andrew Helfer

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Supergirl Carousel Books

By Andrew Helfer

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Batman

By Alan Burnett, Paul Dini

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Superman

By Andrew Helfer

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Supergirl

By Andrew Helfer

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Batman

By Andrew Helfer

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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.