John Hartman Books

Georgian Bay
Georgian Bay

By John Hartman

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Second nature
Second nature

By John Hartman

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Eternal Bridges
Eternal Bridges

By John Hartman

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FRUELIC S LAIR
FRUELIC S LAIR

By John D. Hartman

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John Hartman Cities
John Hartman Cities

By John Hartman

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Urban transportation indicators
Urban transportation indicators

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Fuel cells, on the verge
Fuel cells, on the verge

By John Hartman

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Related Articles from our Blog

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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