Rudolf Simek Books

Heaven and earth in the Middle Ages
Heaven and earth in the Middle Ages

By Rudolf Simek

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What were the ideas held by medieval man concerning the size and shape of the earth? How many planets were there, and of what material was the universe constructed? What was the relationship betwee...

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Artus Lexikon
Artus Lexikon

By Rudolf Simek

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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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