Walter Popp Books

Self's Punishment: A Mystery

By Bernhard Schlink

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Self's Punishment

By Walter Popp, Bernhard Schlink

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As a young man, Gerhard Self served as a Nazi prosecutor. After the war he was barred from the judicial system and so became a private investigator. He has never, however, forgotten his complicity...

Self s Punishment

By Bernhard Schlink

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Selbs Justiz

By Bernhard Schlink, Popp

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Diagnoselexikon Arbeits und Umweltmedizin. Krankheitsursachen in Umwelt und Arbeitswelt.

By Walter Popp

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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.