Hans W. Gatzke Books

Beginning with Bismarck's forging of a nation with "iron and blood," Gatzke tells of Germany's relentless struggle for domination in Europe and in the West, its defeat in two world wars, its divisi...

Present in Perspective

By Hans W. Gatzke

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Germany s Drive to the West

By Hans W. Gatzke

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Stresemann and the Rearmament of Germany

By Professor Hans Wilhelm Gatzke

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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.