John Mangrum Books

Munchkin Monster Manual 2.5

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The twisted geniuses behind the first Munchkin Monster Manual are back! The Munchkin Monster Manual 2.5 contains 3,905 monsters -- of which only 3,872 are orcs -- including such fell nasties as Aun...

Hunter Book Innocents *OP

By Steve Miller, Ken Cliffe, John Mangrum, Philippe Boulle, Andrew Wyatt, Adam Tinworth

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Ravenloft Gazetteer, Vol. 5

By Steve Miller, John Mangrum, Jackie Cassada, Jackie Cassada, John Mangrum, Steve Miller

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Book by Jackie Cassada, John Mangrum, Steve Miller

Ravenloft Gazetteer, Vol IV

By John Mangrum, John W. Mangrum, Anthony Pryor, Ryan Naylor, James Lowder, Andrew Wyatt, Jackie Cassada, Voronica Whitney-Robinson

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Legacies of Violence Twisted shapechangers and immortal tyrants strike terror into the denizens of Ravenloft's southwestern Core. The twisted desires of Borca's dual rulers, the curse at the heart...

Ravenloft: Player'S Handbook

By John Mangrum, John W. Mangrum, Andrew Cermak, Nicky Rea, Andrew Wyatt, Jackie Cassada

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Within the darkness, terror reigns. Vampires rule the night. Shapeshifters howl beneath the gibbous moon. Ancient evil and new-made ghosts and ghouls prey upon a populace ruled by fear. Yet within...

Munchkin D20 Monster Manual

By Steve Jackson Games, John Mangrum, John W. Mangrum, John W. Mangrum, Steve Jackson Games

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Steve Jackson d20 Munchkin Campaign Book

Pathfinder Campaign Setting: Ships Of The Inner Sea

By Philip A. Lee, Chris A. Jackson, John Mangrum, Paris Crenshaw, Paizo Staff, Benjamin Bruck, Amanda Hamon Kunz

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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.