William O. Kellogg Books

How to Prepare for the Advanced Placement Examinations
How to Prepare for the College Level Examination Programme
American history the easy way
How to Prepare for High School Entrance Examinations
How to Prepare for High School Entrance Examinations

By William O. Kellogg, Max Peters

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A study guide to prepare for the SSAT and Cooperative Admissions Examination, with sample tests.

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Out of the past
Out of the past

By William O. Kellogg

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Greece and the Aegean
Greece and the Aegean

By William O. Kellogg

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American History the Easy Way
American history the easy way
American history the easy way

By William O. Kellogg

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Reviews the history of the United States, from prehistory through 1990, and includes study questions.

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How to prepare for the advanced placement examination AP, United States history
Barron's AP United States History

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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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