Howard Blum Books

The Floor of Heaven

By John H. Mayer Narrator Howard Blum Au

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La Brigada

By Howard Blum Alvaro Garcia

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Dark Invasion: 1915: Germany's Secret War and the Hunt for the First Terrorist Cell in America

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Dark Invasion: 1915: Germany'S Secret War And The Hunt For The First Terrorist Cell In America

By Howard Blum

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Combining The Pulsating Drive Of Showtime's Homeland With The Fascinating Historical Detail Of Such Of Narrative Nonfiction Bestsellers As Double Cross And In The Garden Of Beasts, Dark Invasion Is...

Dark Invasion

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From A Note to the reader... In the nonfiction spy tale that follows, I tell how a sophisticated foreign intelligence organization launched a covert campaign of terror--bombs, germ warfare, and mu...

Last Goodnight A World War II Story of Espionage Adventure and Betrayal The

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From "A Note to the Reader" IN THE MAIN BUILDING OF the CIA’s sprawling Virginia campus, past the security guards and the detection machines, up a staircase and at the end of a winding corridor th...

I Pledge Allegiance: I Pledge Allegiance

By . Blum, Howard Blum, Blum.

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Out There

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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.