Jeffrey A. O Hare Books

The Big Book of Mazes

By Jeffrey A. O Hare

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Globe probe featuring Cincinnati Holmes

By Jeffrey A. O Hare

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Presents the travel journal of fictional adventurer Cincinnati Holmes, who introduces the major countries, cities, and geographical features of the seven continents using maps, games, and quizzes.

Searchin Safari

By Jeffrey A. O Hare

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The Giant Book of Mazes

By Jeffrey A. O Hare

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Best of Puzzlemania Mazes

By Jeffrey A. O Hare

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The Best of Puzzlemania Mazes

By Jeffrey A. O Hare

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The Best of Puzzlemania Mazes

By Jeffrey A. O Hare

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Batman

By Jeffrey A. O Hare, Alan Grant, Norm Breyfogle, Sam Hamm, John Wagner

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Hanukkah, festival of lights

By Jeffrey A. O Hare

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Presents stories, songs, recipes and activities related to the celebration of Hanukkah. This book explores the many aspects of the holiday, from the very first Hanukkah in the ancient temple to tod...

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.