Roger Duvoisin Books

The Frog in the Well

By Alvin R. Tresselt, Roger Duvoisin

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What did you leave behind?

By Alvin Tresselt

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Suggests vivid intangible souvenirs one carries away from such places and experiences as a beach, a parade, the woods, a snow-covered hill, and a county fair.

Happy Hunter.

By Roger Duvoisin

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Donkey donkey

By Roger Duvoisin

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The little donkey was unhappy because, of all the animals on the farm, he had the only ears that stuck straight up.

Donkey Donkey

By Roger Duvoisin

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Petunia

By Roger Duvoisin

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Petunia Takes a Trip

By Roger Duvoisin

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Petunia

By Roger Duvoisin

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Donkey-donkey

By Roger Duvoisin

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The illustrated children’s classic about friendship and self-acceptance, from a Caldecott Medal–winning illustrator and the author of Petunia—perfect for reading aloud with kids a...

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.