Donald R. Hopkins Books

The Greatest Killer
The Greatest Killer

By Donald R. Hopkins

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Princes and peasants
Princes and peasants

By Donald R. Hopkins

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Traces the history of the disease of smallpox from its possible origins in prehistoric times to its eradication in 1977.

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Greatest Killer
Greatest Killer

By Donald R. Hopkins

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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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