Doug Cushman Books

Inspector Hopper's Mystery Year

By Doug Cushman

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Inspector Hopper and his partner McBugg solve a mystery in each season of the year.

Inspector Hopper's Mystery Year

By Doug Cushman

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Inspector Hopper and his partner McBugg solve a mystery in each season of the year.

Aunt Eater's mystery vacation

By Doug Cushman

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A mystery-loving anteater has a chance to solve several mysteries during her vacation at the Hotel Bathwater.

The ABC Mystery

By Doug Cushman

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An alphabetical list of people, objects, and clues leads Inspector McGroom to a stolen work of art.

Camp Big Paw

By Doug Cushman

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Cyril and his cabin mates Ben and Obie run into trouble with the camp bully during Field Day contests at Camp Big Paw.

Camp Big Paw

By Doug Cushman

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Cyril and his cabin mates Ben and Obie run into trouble with the camp bully during Field Day contests at Camp Big Paw.

Aunt Eater's Mystery Christmas

By Doug Cushman

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Aunt Eater must interrupt her holiday preparations to solve some Christmas Eve mysteries.

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.