Walter J. Karcheski Jr. Books

Arms and armor in the Art Institute of Chicago

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The Art Institute of Chicago's George F. Harding Collection of arms and armor is one of the most popular exhibits in the museum, as well as one of the greatest collections of arms and armor in Nort...

Imperial Austria

By Peter Krenn

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The Medieval Armour From Rhodes

By Walter Karcheski, Paula Turner, Thom Richardson, Walter J. Karcheski Jr.

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Imperial Austria Treasures of Art Arms

By Peter Krenn

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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.