Roger Portal Books

The Slavs
The Slavs

By Roger. Portal

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The Slavs
The Slavs

By Roger Portal

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xix, 508 p. 16 plates. illus., facsims, maps, music, ports. 25 cm.

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Pierre le Grand
Pierre le Grand

By Roger Portal

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Die Slawen
Die Slawen

By Roger Portal

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756 p., [20] leaves of plates (some col.) : ill., map ; 24 cm.

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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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