William E. IV Butterworth Books

The outlaws

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Charlie Castillo's secret unit has been disbanded-but that doesn't mean he's out of business. As experience has painfully shown him, there are many things the intelligence community can't do, won't...

Top Secret

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

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Outlaws

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

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MASH Goes to Hollywood

By Richard Hooker, William E. IV Butterworth

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MASH Goes to London

By Richard Hooker, William E. IV Butterworth

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MASH Goes to Vienna

By Richard Hooker, William E. IV Butterworth

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MASH Goes to Moscow

By Richard Hooker, William E. IV Butterworth

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Curtain of Death

By William E. Butterworth IV, W.E.B. Griffin

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From #1 New York Times-bestselling author W.E.B. Griffin comes a dramatic thriller in the Clandestine Operations series about the Cold War, the fledgling Central Intelligence Agency—and a new...

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.