John Dennis Fitzgerald Books

The Great Brain

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This first book in the series is a great combination of The Adventures of Tom Sawyer and The Terrible Two series, and is perfect for fans of Roald Dahl.The best con man in the Midwest is only ten y...

Me and My Little Brain

By John Dennis Fitzgerald

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This third book in the series is a great combination of The Adventures of Tom Sawyer and The Terrible Two series, and is perfect for fans of Roald Dahl.Tom a.k.a. the Great Brain, is off to boardin...

More Adventures of the Great Brain

By John Dennis Fitzgerald

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This second book in the series is a great combination of The Adventures of Tom Sawyer and The Terrible Two series, and is perfect for fans of Roald Dahl.Has Tom, a.k.a. the Great Brain, given up hi...

The return of the Great Brain

By John Dennis Fitzgerald

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The Adventures of the Great Brain

By John Dennis Fitzgerald

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The Great Brain Does it Again

By Mercer Mayer, John Dennis Fitzgerald

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The Great Brain at the academy

By Mercer Mayer, John Dennis Fitzgerald

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The Great Brain faces the challenge of life at a strict Catholic boarding school with daring exploits and money-making schemes.

The Great Brain Reforms Great Brain

By John Dennis Fitzgerald

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Me and my little brain

By John Dennis Fitzgerald

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In the absence of his older brother, the Great Brain, J.D. finds that his own little brain can accomplish feats on a somewhat lesser scale.

The return of the Great Brain

By John Dennis Fitzgerald

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In turn-of-the-century Mormon Utah, The Great Brain struggles to stay reformed now that his friends have threatened to ostracize him if he pulls even one more swindle.

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.