Harry Armstrong Books

Human body.
Human body.

By Caroline Grimshaw, Harry Armstrong

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Questions and answers and activities explore the definition, cause, effects, and uses of sound.

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New Jersey firsts
New Jersey firsts

By Harry Armstrong

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Pawn s Gambit
Pawn s Gambit

By Harry Armstrong

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Pawn s Gambit
Pawn s Gambit

By Harry Armstrong

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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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