Theodor Zahn Books

Dragon and soldier

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Fourteen-year-old Jack, who is the human host in a symbiotic relationship with a dragon warrior named Draycos, joins a mercenary outfit to uncover those behind a vast conspiracy to wipe out Draycos...

Night Train to Rigel

By Theodor Zahn

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The Green and the Gray

By Theodor Zahn

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Dragon and Herdsman

By Theodor Zahn

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Dragon and Judge

By Theodor Zahn

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Just when fourteen-year-old Jack Morgan thinks he and his symbiont, the dragon warrior Draycos, are on the brink of finding information about the destruction of Draycos's race, he is kidnapped by a...

Dragon and Liberator

By Theodor Zahn

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The Third Lynx

By Theodor Zahn

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Odd girl out

By Theodor Zahn

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Dragon and Soldier

By Theodor Zahn

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This series title continues the story of Jack Morgan. He fights with Draycos, trying to fend off attempts to kill the draconic race. To do this, he enlists in a mercenary army that recruits teenagers.

Dragon and soldier

By Theodor Zahn

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

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.