Andrzej Chwalba Books

1914 1918
1914 1918

By Andrzej Chwalba

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Jozef Pilsudski
Jozef Pilsudski

By Andrzej Chwalba

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Palac Puslowskich
Palac Puslowskich

By Andrzej Chwalba

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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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