Christopher M. Geeson Books

Atomic Age Cthulhu Tales of Mythos Horror in the 1950s Chaosium Fiction

By Michael Szymanski, Cody Goodfellow, Peter Rawlik, Josh Reynolds, Neil Baker, Ed Erdelac, Tom Lynch, Adam Bolivar, Christine Morgan, Jeffrey Thomas, Jason Andrew, Bear Weiter, Sam Stone, Charles Christian, William Meikle, Christopher M. Geeson

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Steampunk Cthulhu

By Edward M. Erdelac, John Goodrich, Josh Reynolds, Brian M. Sammons, Leigh Kimmel, Glynn Owen Barrass, Carrie Cuinn, Lee Clark Zumpe, Daniele Serra, D.J. Tyrer, Pete Rawlik, Adam Bolivar, Christine Morgan, Jeffrey Thomas, Robert Neilson, William Meikle, Thana Niveau, Christopher M. Geeson

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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.