Roel Janssen Books

Die Euro Falscher. 2 CDs. Der Wirtschaftskrimi zur neuen Wahrung.

By Tom Freudenthal, Marian Symczyk, Reinhart Von Stolzmann, Susanne Grawe, Roel Janssen

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Fout goud

By Roel Janssen

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Nadat een jongeman enkele gouden munten in een erfenis heeft gevonden, komt hij op het spoor van een enorme hoeveelheid goud die de nazi's in 1940 van de Nederlanders vorderden.

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.