John O. Koehler Books

Stasi

By John O. Koehler

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Stasi

By John O. Koehler

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In this Narrative, John Koehler details the widespread activities of East Germany's Ministry for State Security, or "Stasi." The Stasi, which spread its tentacles like a giant octopus over East Ger...

Spies in the Vatican

By John Koehler

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Chodzi o papieza

By John O. Koehler

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Il libro che il Vaticano non ti farebbe mai leggere

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Stasi

By John O. Koehler

Average: 0.00, 0 Ratings

Spies in the Vatican

By John O. Koehler

Average: 0.00, 0 Ratings

Evaluates the Soviet Union's espionage campaign against the Catholic Church, drawing on previously unseen documents to reveal an assassination order against Pope John Paul II and a Russian spy netw...

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.