William Simoni Books

Madness in Freeport

By William Simoni, Gerald Brom

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Book Of The Righteous

By Brian Despain, Chris Pramas, Aaron Loeb, William Simoni, Aaron J Loeb, Aaron Loeb, Brian Despain

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The Book of the Righteous presents the most comprehensive pantheon ever seen in the d20 System. This massive, 320-page hardback provides more than 20 pick-up-and-play churches corresponding to gods...

Warhammer RPG: Karak Azgal

By Green Ronin Publishing, Evan Sass, Robert J. Schwalb, Green Ronin, William Simoni

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This adventure and setting sourcebook for Warhammer Fantasy Roleplay contains maps of the city and its mines and caverns, extensive tools for creating adventures in Karak Azgal, detailed lairs for...

Black Sails Over Freeport

By William Simoni, Robert J. Toth, Rob Lawson, Brian E. Kirby

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Freeport: The Freeport Trilogy

By Robert J. Toth, Chris Pramas, William Simoni

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In August 2000, Green Ronin released the adventure Death in Freeport and kicked off the d20 phenomenon. This Ennie and Origins Award winning adventure was the first in the Freeport trilogy, which w...

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.