Roger Duvoisin Books

When Veronica arrives at Petunia's farm, the animals object to her ways and looks until she gets sick, at which time, they decide they like her after all.

Veronica

By Roger Duvoisin

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Donkey Donkey

By Roger Duvoisin

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Petunia

By Roger Duvoisin

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When Roger Duvoisin first introduced children to his proud and silly goose, Petunia, in 1950, it was love at first sight. Those children have grown up, but Petunia is every bit as fresh and funny a...

Petunia Beware

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.