John Polojac Books

DC Adventures RPG Heroes & Villains Volume 1

By Aaron Sullivan, Alejandro Melchor, Christopher McGlothlin, Seth Johnson, Darren Bulmer, Chris Huff, Sean Johnson, Steven Trustrum, Jack Norris, Matthew McFarland, Jason Mical, Steve Kenson, Walt Ciechanowski, Mike Mulvihill, John Polojac

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DC Adventures Universe

By Aaron Sullivan, Seth Johnson, Darren Bulmer, Steve Kenson, Jon Leitheusser, John Polojac

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Wild Cards Rpg All In

By Steve Kenson, Bill Bodden, Dwayne Butchino, John Polojac

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Time Traveler'S Codex

By Clio Davis, John Compton, Crystal Fraiser, Chris Pramas, Fred Wan, Steve Kenson, Jaym Gates, John Polojac, Jordan Wyn, Jennifer R Dworschack-Kinter, Conceptoplis

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Heroism Knows No Century! Vikings plunder jewelry stores along the waterfront! Killer robots from the future hunt Abraham Lincoln! And the heroes are on trial for crimes they havent committed... ye...

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.