David L. Ganz Books

The Essential Guide to Investing in Precious Metals

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Gold. Silver. Platinum. Palladium. Want more than a piece of paper with a stock number on it to show for your investment? Then learn about all the ways you can add precious metals to your portfolio...

Profitable Coin Collecting

By David L Ganz

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There's no mistaking the purpose of this book, or the opportunities it may provide you with. This reference contains deep market analysis of popular rare U.S. coins minted in the last century, with...

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.