Harden Books

California Geology
California Geology

By Deborah Reid Harden, Harden, Deborah R. Harden, Harden, Deborah R., Harden

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Organized to introduce basic principles and work toward a unifying picture of California geology. With California plate tectonics as a central theme, this book is intended to acquaint non- geologis...

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Poems and Illustrations
Poems and Illustrations

By

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Bulletin Boards Made the Easy Way
Bulletin Boards Made the Easy Way

By Harden

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Interstellar Advocate
Interstellar Advocate

By Will Harden

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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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