Chad Underkoffler Books

Atomic Sock Monkey Press

By Chad Underkoffler

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Gamma World Game Masters Guide Gamma World

By Lizard, Greg Stolze, Doug Oglesby, Bruce Baugh, Chad Underkoffler, Werner Hagen

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Weep Unknown Armies

By John Tynes, Rick Neal, Greg Stolze, Chad Underkoffler, James Palmer

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Postmodern Magick Unknown Armies

By John Tynes

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Your Story: The Dresden Files Role Playing Game: Volume 1: Ehp3001

By Ryan Macklin, Jim Butcher, Leonard Balsera, Chad Underkoffler, Evil Hat Productions

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Tell Us Your StoryBeneath the "normal" surface of the world are things and people which most of us don't want to know about, and will do our best to forget about if we ever come near them. People w...

Break Today

By Chad Underkoffler, Greg Stolze, Greg Stolze & Chad Underkoffler

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Hey, foodtube -- have some fries with your universal transcendance! The bizarre occult conspiracy known as Mak Attax wants to upsize your soul, one fast-food burger at a time, until we all go danci...

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.