Herbert O Yardley Books

The American Black Chamber
The American Black Chamber

By H O Yardley

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This book contains invaluable information on codes and code breaking, including how to make a code and how to break a code.

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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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