Marilyn Helmer Books

Pirate island treasure

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Charlotte and her brother, Jacob, are thrilled to head off on an adventure in their grandpa's boat, The Seawind. As they set sail for Pirate Island, they look forward to a day of beachcombing, play...

Fog Cat

By Marilyn Helmer

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Mr. McGratt and the Ornery Cat

By Marilyn Helmer

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Three Tales of Three Once Upon a Time

By Marilyn Helmer

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Three Prince Charming Tales Once Upon a Time

By Marilyn Helmer

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Fog Cat

By Marilyn Helmer

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Three Barnyard Tales Once Upon a Time

By Marilyn Helmer

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Three Teeny Tiny Tales Once Upon a Time

By Marilyn Helmer

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Three Tales of Enchantment Once Upon a Time

By Marilyn Helmer

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Three Tales of Trickery Once Upon a Time

By Marilyn Helmer

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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.