Thomas Girard Books

Mermaids of the Deep Blue Sea

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The Aldens have joined Dr. Iris Perez as she investigates legendary creatures around the world. In this adventure, the children investigate what might be living in the deep trench off the coast of...

The Secret of Bigfoot Valley

By Gertrude Chandler Warner

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The Aldens are spending their first week of summer at Camp Quest in Colorado. The children are excited to learn about fossil hunting and paleontology from renowned scientist Dr. Iris Perez. But str...

Mystery of the Hidden Elves

By Gertrude Chandler Warner

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The Aldens have joined Dr. Iris Perez as she investigates legendary creatures around the world. In this adventure, the children travel to Iceland to look into stories of mischievous elves causing t...

Mermaids of the Deep Blue Sea

By Gertrude Chandler Warner

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The Aldens have joined Dr. Iris Perez as she investigates legendary creatures around the world. In this adventure, the children investigate what might be living in the deep trench off the coast of...

Myth of the Rain Forest Monster

By Gertrude Chandler Warner

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The Aldens are joining Dr. Iris Perez as she investigates legendary creatures around the world. In the last leg of the journey, the children travel to the Amazon Rain Forest. They love learning abo...

The Secret of Bigfoot Valley

By Gertrude Chandler Warner

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Mystery of the Hidden Elves

By Gertrude Chandler Warner

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Myth of the Rain Forest Monster

By Gertrude Chandler Warner

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The Boxcar Children Creatures of Legend 4-Book Set

By Gertrude Chandler Warner

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This set includes all 4 paperback books from the brand-new Boxcar Children Creatures of Legend miniseries. When the Aldens agreed to go to paleontology camp, they thought they would be looking for...

Courage on the Battlefield

By Thomas Girard, Nel Yomtov, Good Good Illustration

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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.