Helge Drafz Books

Georg Ettl: Arbeiten 1968-1989

By Jiri Svestka, Michael Robinson, Helge Drafz, Georg Ettl, Johannes Cladders, Stuart Spencer, W G Klinzing

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Am Niederrhein

By Helge Drafz

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Erwin Quedenfeldt (1869-1948) war der grosse Landschaftsfotograf des Niederrheins vor dem Ersten Weltkrieg. In zahllosen Aufnahmen hielt er zwischen 1904 und 1915 Stadt und Dorfansichten, Strassenz...

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.