Robin Koontz Books

Zelda la Cenicienta

By Robin Michal Koontz

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Juanita y los frijoles magicos

By Robin Michal Koontz

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After climbing up a magic beanstalk, Juanita encounters a giant and shares her beans with him. Juanita se lleva una sorpresa al sembrar las semillas que le dio un forastero.

Patita Dorada y los Tres Castores Goldie Duck and the Three Beavers

By Robin Michal Koontz

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Los Tres Pequenos Recicladores the Three Little Recyclers

By Robin Michal Koontz

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Marine Biologists

By Robin Michal Koontz

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Volcanologists

By Robin Michal Koontz

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Entomologists

By Robin Michal Koontz

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Marine Biologists

By Robin Michal Koontz

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Volcanologists

By Robin Michal Koontz

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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.