Mark Mortensen Books

George W. Hamilton USMC
George W. Hamilton USMC

By Mark Mortensen

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"A leader of the first major American assault on June 6, 1918, and the last ranking officer in the American Expeditionary Forces to learn that the war was over, Hamilton earned the Distinguished Se...

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George W. Hamilton USMC
George W. Hamilton USMC

By Mark Mortensen

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Leveling up
Leveling up

By Mark Mortensen, Dawn Bushaus

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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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