Christine Hopfengart Books

1914

By Uwe M. Schneede

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Streifzuge durch die Moderne

By Ulrike Lorenz, Christine Hopfengart, Gerard A. Goodrow

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Paul Klee Musik und Theater in Leben und Werk

By Paul Klee

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Ad Parnassum auf dem Prufstand

By Marianne Keller, Christine Hopfengart, Samuel Vitali

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Klee and Kandinsky

By Vivian Endicott Barnett

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Paul Klee and Wassily Kandinsky, two of the most influential figures in the modernist movement, are the subject of this illuminating book that opens a dialogue between their work, friendship, and i...

Paul Klee

By Edited By Angela Lampe

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Offering a fresh look at one of the major artists of the 20th century, this book illustrates how Paul Klee’s critical and ironic take on life was evident in every stage of his oeuvre. Known f...

Klee & Kandinsky

By Annegret Hoberg, Michael Baumgartner, Paul Klee, Christine Hopfengart, Vivian Endicott Barnett

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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.