Chris O Halloran Books

Hellboy: The Bones of Giants

By Written By Mike Mignola, Letters By Clem Robins., Christopher Golden With Art By Matt Smith Colors By Chris O Halloran

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When a startling discovery is made in Sweden, the B.P.R.D. sends Hellboy and Abe Sapien to investigate. What ensues is a wild adventure full of Norse legends, mythical creatures, and a threat that...

Death Orb Volume 1

By Alejandro Aragon Ryan Ferrier Chris O Halloran

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Explore an American wasteland full of strange science, mutant biker gangs, and mysterious death cults determined to rebuild the world in their image. An ax-wielding warrior chops a righteous path t...

Mortal Terror Volume 1

By Story By Christopher Golden, Tim Lebbon. Art By Peter Bergting. Colors By Chis O Halloran. Letters By Clem Robins.

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A vampire-flipped Dracula graphic novel in which mortality means life…and life means death.Vampires Jonathan Harker, Lucy Westenra, and Mina Murray live in underground London, trying to keep...

Ice Cream Man Vol. 5

By Chris O Halloran, Martin Morazzo, W. Maxwell Prince

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Generation Gone Vol. 1

By Chris O Halloran, Andre Lima Araujo, Ales Kot

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Time Before Time Volume 1

By Joe Palmer, Declan Shalvey, Chris O Halloran, Rory McConville

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Write It in Blood OGN

By Joe Palmer, Chris O Halloran, Rory McConville

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Time Before Time Volume 2

By Joe Palmer, Declan Shalvey, Chris O Halloran, Rory McConville

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Ice Cream Man Vol. 6

By Chris O Halloran, Martin Morazzo, W. Maxwell Prince

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Ice Cream Man Vol. 1

By Martin Morazzo, W. Maxwell Prince, Chris O Halloran

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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.