Allen Kurzweil Books

Leon and the Spitting Image

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Leon, a fourth grader at The Ethical School, tries to outwit the school bully and learn to sew for fanatical teacher Miss Cronheim, with unexpected help from his final project-- a doll with magical...

Leon and the Spitting Image

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Leon and the Spitting Image

By Allen Kurzweil

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Leon and the Champion Chip

By Allen Kurzweil

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Employing scientific methods learned in Mr. Sparks's class, fifth-grader Leon competes in a potato chip tasting contest and takes revenge against Lumpkin the bully.

Leon and the Champion Chip

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Leon and the Champion Chip

By Allen Kurzweil

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Leon and the Spitting Image

By Allen Kurzweil

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Leon and the Champion Chip CD

By Allen Kurzweil

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Leon and the Spitting Image

By Allen Kurzweil

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The Grand Complication

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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.