Charles Keller Books

Colossal Fossils - Dinosaur Riddles.
Tongue twisters
Tongue twisters

By Charles Keller

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An illustrated collection of tongue twisters and other hard to say rhymes.

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Best Joke Book Ever
Best Joke Book Ever

By Charles Keller

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Excuses Excuses
Excuses Excuses

By Charles Keller

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The planet of the grapes
The planet of the grapes

By Charles Keller

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Humor relating to the movie world, sports, television, and other areas of the performing arts.

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The Little Giant Book of Jokes
ALEXANDER THE GRAPE
Daffynitions
Daffynitions

By Charles Keller, F. A. Fitzgerald

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More Ballpoint Bananas
Still Going Bananas

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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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