Jenns Eric Howoldt Books

Expedition Kunst: Die Entdeckung der Natur von C. D. Friedrich bis Humboldt. Ausstellung 25. Oktober 2002 bis 16. Februar 2003 in der Hamburger Kunsthalle

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Nicolai Abildgaard

By Jenns Eric Howoldt, Hubertus Gassner

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Der Freie Bund zur Einburgerung der Bildenden Kunst in Mannheim

By Jenns Eric Howoldt

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Adolph Menzel in der Hamburger Kunsthalle

By Jenns Eric Howoldt

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Danemarks Aufbruch in die Moderne

By Stefanie Wiech, Sylvie Pochet, Mette Thiessen, Jenns Eric Howoldt, Neela Struck

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In den achtziger Jahren des 19. Jahrhunderts vollzog sich in der dänischen Kunst die entscheidende Wende zur Moderne. Der Prozess, der auch die Gesellschaft erfasste, war so umfassend, dass man heu...

Wolfgang Mattheuer

By Wolfgang Mattheuer

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Max Liebermann in Hamburg

By Jenns Eric Howoldt

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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.