David A. Eitelbach Books

Pathfinder Companion: Dwarves Of Golarion

By James Jacobs, Paizo Inc., David A. Eitelbach

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Born ages ago in lightless caverns, the dwarves surged upward in pursuit of a divine prophecy, driving the feral orcs before them until they reached the surface world in the fabled Quest for Sky. N...

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.

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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.