Geoffrey M. Horn Books

Washington, D.C.

By Geoffrey M. Horn

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World Almanac Library of American Government

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The Congress

By Geoffrey M. Horn

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435 members of the House of Representatives and 100 senators. Together, they make up the Congress of the United States -- the branch of the U.S. government that makes the country's laws. In this vo...

The presidency

By Geoffrey M. Horn

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The Armed Forces World Almanac Library of American Government

By Geoffrey M. Horn

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Congress World Almanac Library of American Government

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The presidency

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The Supreme Court World Almanac Library of American Government

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Sports therapist

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The Bill of Rights and Other Amendments World Almanac Library of American Government

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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.