Greg Keyes Books

Footsteps in the Sky
Footsteps in the Sky

By J. Gregory Keyes

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Newton s Cannon The Age of Unreason Book 1
A Calculus of Angels The Age of Unreason Book 2
The Reign of the Departed The High and Faraway Book One
Kingdoms of the Cursed The High and Faraway Book Two 2
Independence Day: Crucible (The Official Prequel)
Independence Day: Crucible (The Official Prequel)

By Greg Keyes

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Cities were crushed by the falling spacecraft—but one ship didn’t crash. It remained intact, and disgorged hordes of alien soldiers determined to fight to the death. The abandoned...

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Interstellar: The Official Movie Novelization
Interstellar: The Official Movie Novelization

By Greg Keyes

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THE END OF EARTH WILL NOT BE THE END OF USFrom acclaimed filmmaker Christopher Nolan (The Dark Knight Triology, Inception), this is the chronicle of a group of explorers who make use of a newly dis...

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War for the Planet of the Apes: Revelations
War for the Planet of the Apes: Revelations

By Greg Keyes

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Driven from their woodland home, Caesar and his apes are still recovering from the takeover by renegade ape Koba. Caesar is desperate to avoid war with the humans, but this is a faint hope, as his...

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Godzilla: King of the Monsters - The Official Movie Novelization
Godzilla: King of the Monsters - The Official Movie Novelization

By Greg Keyes

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The official novelization of the summer blockbuster Godzilla: King of the Monsters, the latest film in the MonsterVerseTM franchise, starring Kyle Chandler, Vera Farmiga, Millie Bobby Brown, with K...

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Marvel's Avengers: The Extinction Key
Marvel's Avengers: The Extinction Key

By Greg Keyes

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The official prequel to Marvel's Avengers from Marvel, Crystal Dynamics, Eidos Montreal, and Square Enix, with an exclusive adventure that leads into the game itself.The official prequel to the blo...

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If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

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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