Kirk R. Johnson Books

Prehistoric journey
Prehistoric journey

By Kirk R. Johnson

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Ancient Denvers
Ancient Denvers

By Kirk R. Johnson

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Cruisin the fossil coastline
Cruisin the fossil coastline

By Kirk R. Johnson

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"In this long-awaited sequel Kirk Johnson and Ray Troll are back on a road trip—driving, flying, and boating their way from Baja, California to northern Alaska in search of the fossil secrets of No...

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Prehistoric journey
Prehistoric journey

By Kirk R. Johnson

Average: 0.00, 0 Ratings

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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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