Tom Siddell Books

Gunnerkrigg Court .

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Antimony Carver is a precocious and preternaturally self-possessed young girl starting her first year of school at gloomy Gunnerkrigg Court, a very British boarding school that has robeots running...

Gunnerkrigg Court .

By Tom Siddell

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Antimony Carver is a precocious and preternaturally self-possessed young girl starting her first year of school at gloomy Gunnerkrigg Court, a very British boarding school that has robeots running...

Annie and her best friend Kat begin their second year at gloomy Gunnerkrigg Court, a very British boarding school that has robots running around along side body-snatching demons, forest gods, and t...

Gunnerkrigg Court

By Tom Siddell

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Gunnerkrigg Court

By Tom Siddell

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Gunnerkrigg Court Volume 4

By Thomas Siddell

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Gunnerkrigg Court Volume 1

By Written, Illustrated By Thomas Tom Siddell

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Tom Siddell’s acclaimed, long-running webcomic comes to Dark Horse, with a new cover and updated interior art!After the death of her mother and her father’s disappearance, a young girl...

Gunnerkrigg Court Volume 1 Limited Edition

By Tom Siddell

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Refine

By Thomas Siddell

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Munchkin Vol. 1

By Steve Jackson Steve Jackson Games, Rian Sygh, Thomas Siddell, Ian McGinty, Jim Zub

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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.