Roger Duvoisin Books

Snowy and Woody
Snowy and Woody

By Roger Duvoisin

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A polar bear and a brown bear help camouflage each other.

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The importance of Crocus
The importance of Crocus

By Roger Duvoisin

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Crocus the crocodile discovers his special talents when the Sweetpeas build a pond on their property.

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PETUNIA SIL GOOS STY Five Read Aloud Classics
The Rain Puddle
The Rain Puddle

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Wobble the Witch Cat
Missing Milkman
Missing Milkman

By Roger Duvoisin

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One Thousand Christmas Beards
What Did You Leave Behind?
Petunia
Petunia

By Roger Duoisin

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Petunia
Petunia

By Roger Duvoisin

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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.

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