Danielle Mentzer Books

The Greenzys

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" ... the oldest living tree is in danger after years of neglect. When a group of animals volunteer to help protect her and the Earth, they turn green and become the Greenzys! The animals set off o...

Duck Naked Sitting Ducks Sitting Ducks

By Danielle Mentzer

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The Greenzys

By Danielle Mentzer

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Plucked duck!

By AnnMarie Harris

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When he begins to molt, Bill the duck is unwilling to patiently wait for new feathers to grow and, armed with a map and a secret password, sets out with Aldo the alligator to find a cure.

Canard deplume canard deprime

By Michael Bedard

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Pato Desplumado

By Michael Bedard

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Fred Se Derrite

By Michael Bedard

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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.