William E. Butterworth IV Books

The Saboteurs

By William E. Butterworth IV, William E. Butterworth III

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The Double Agents

By William E. Butterworth IV, William E. Butterworth III

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Death and Honor

By William E. Butterworth IV, William E. Butterworth III

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The double agents

By William E. Butterworth IV, William E. Butterworth III

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Canidy, Fulmar, and their colleagues in the Office of Strategic Services work to convince Axis forces that the Allies are not planning an invasion of Sicily, an effort that is undermined by a trait...

Death and honor

By William E. Butterworth IV, William E. Butterworth III

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The year is 1943, and Argentina is officially neutral, but crawling with every kind of spy, sympathizer, and military official imaginable. The hero is Cletus Frade, a Marine pilot recruited by the...

Road Racer GB

By William E. Butterworth IV

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Redline 7100 GB

By William E. Butterworth IV

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The Saboteurs

By William E. Butterworth IV, William E. Butterworth III

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W.E.B. Griffin continues his gripping Men at War series, featuring the legendary OSS. As the Battle of the Atlantic rages, German U-boats are sinking U.S. vessels at will. Meanwhile, preparations...

Victory and Honor

By William E. Butterworth IV, William E. Butterworth III

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W.E. B. Griffin returns to his Honor Bound series set in the shadows of World War II espionage in South America… May 1945: Just weeks after Hitler’s suicide, Cletus Frade and his colleagues in the...

The Attack

By William E. Butterworth IV, William E. Butterworth III

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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.