David J. Alvarez Books

Spies in the Vatican

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"Reviewing the pontificates of ten popes - from Pius VII, Napoleon's nemesis, to Pius XII, maligned by some as "Hitler's pope"--Alvarez provides the first history of the intelligence operations and...

Allied and axis signals intelligence in World War II

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Allied and axis signals intelligence in World War II

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Espionnage au Vatican

By David Alvarez

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Les espions du Vatican espionnage et intrigues de Napoleon a la Shoah

By David Alvarez

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Aa Secrets D'État : Livre Gratuit

By David J. Alvarez, David Alvarez, Michael Müller Et Erich Schmidt-Eenboom...

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1 vol. (331 p.) : 18 cm

Pope s Soldiers

By David Alvarez

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Spies in the Vatican

By David Alvarez

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Secret Messages

By David Alvarez

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Nothing Sacred

By David Alvarez, Graham Revd Robert A. Sj

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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.