Geoff Martz Books

Cracking the GMAT
Cracking the GMAT

By Geoff Martz

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The test-prep guide offers proven, detailed guidance and advice for the math, verbal, and essay sections of the test, and this new edition for 2010 includes more than 200 practice questions and exc...

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Princeton Review
Princeton Review

By Geoff Martz

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Cracking the GED
Cracking the GED

By Geoff Martz

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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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