Katy Hall Books

Sheepish Riddles Promo
Creepy Riddles
Creepy Riddles

By Lisa Eisenberg, Katy Hall

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Turkey Riddles
Turkey Riddles

By Lisa Eisenberg, Katy Hall

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Dino Riddles
Dino Riddles

By Lisa Eisenberg, Katy Hall

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Magic in the movies
Magic in the movies

By Jane O Connor

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Discusses special effects used in films, including optical illusions, miniatures, and full-scale, live-action, weather, and makeup effects.

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Garfield
Garfield

By Jean Little, Katy Hall

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101 back to school jokes
101 back to school jokes

By Lisa Eisenberg

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Start the school year laughing. Get back in the swing of things with back-to-school jokes and riddles that will keep you giggling all school year long.

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Pig Jokes and Puzzles
101 Bug Jokes
101 Bug Jokes

By Lisa Eisenberg, Katy Hall

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101 School Jokes

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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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