Ralph Klein Books

Der Novemberpogrom 1938 in Witten

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Kapp Putsch und Marzrevolution 1920 in Witten

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Nicht mehr Krieg noch kein Frieden

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New Proclamation Easter Pentecost Series A 1999

By Thomas Troeger, Robin Mattison, Ralph Klein

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Psychotherapy of the Disorders of the Self. The Masterson Approach

By Ralph Klein, James F. Masterson

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Das KZ Aussenlager in Witten Annen

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In der vorliegenden Studie, die aus der Mitarbeit des Autors in einer Arbeitsgruppe des Projekts „Soziale Stadt Annen“ hervorging, wird die Geschichte des ehemaligen KZ-Außenlagers zusammen mit sei...

Psychotherapy of the Disorders of the Self

By Ralph Klein, James F. Masterson

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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.