Jeffrey A. O Hare Books

Doonesbury Trivia
Doonesbury Trivia

By Jeffrey A. O Hare

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Frogs and toads
Frogs and toads

By Jeffrey A. O Hare

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Discusses the physical characteristics, habitats, behavior, and predators of frogs and toads, focusing on how they hunt and kill their prey.

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Secret codes and hidden messages
Secret codes and hidden messages

By Jeffrey A. O Hare

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Dozens of codes and hidden messages are presented as riddles, poems, and other fun-filled expressions.

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The Giant Book of Mazes
Top Secret Adventures Mexico Puzzle Book
Hanukkah, happy Hanukkah
Secret Codes and Hidden Messages
Bogus Beasts
Bogus Beasts

By Jeffrey A. O Hare

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The Best of Puzzlemania Mazes
Beastly Behaviors
Beastly Behaviors

By Jeffrey A. O Hare

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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.

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