Christopher Freiler Books

Achiever
Achiever

By Christopher Freiler

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The most well-respected, teacher-recommended guide to the AP European History exam is back and better than ever! Written by a long-time leader in the AP Euro community, ACHIEVER is meticulously cra...

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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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