Paul Soifer Books

United States History
United States History

By Paul Soifer

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CliffsAP study guides help you gain an edge on Advanced Placement* exams. Review exercises, realistic practice exams, and effective test-taking strategies are the key to calmer nerves and higher AP...

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U.S. history I
U.S. history I

By Paul Soifer

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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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