Eric Comstock Books

Charlie Piechart and the Case of the Missing Pizza Slice

By Eric Comstock, Marilyn Sadler

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Charlie Piechart and the case of the missing hat

By Eric Comstock

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This math mystery takes place at school&#x;when a purple, sparkly cone-shaped princess hat goes missing! Margot needs her hat in time for the school play (today!), so Charlie and his dog companion,...

Charlie Piechart and the Case of the Missing Dog

By Eric Comstock, Marilyn Sadler

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I Heard a Sound

By By David J. Ward Illustrated By Eric Comstock

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Learn the science of sound with easy experiments and examples from everyday life.Crickets, clarinets, and vocal chords. All vibrate. All make sound.Here is science learning at it's best: a kid-frie...

I Heard a Sound

By By David J. Ward Illustrated By Eric Comstock

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Tangled

By Eric Comstock, Anne Miranda

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Tangled

By Eric Comstock, Anne Miranda

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Great Dictionary Caper

By Eric Comstock, Judy Sierra

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ABC Academy a Is for Alliteration

By Eric Comstock, Allan Wolf

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ABC Academy a Is for Artificial Intelligence

By Eric Comstock, Allan Wolf

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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.