Barbel Holtz Books

"For the first time, this volume presents a systematic edition of archival sources on Prussian censorship policy between the Carlsbad Decrees of 1819 and the March Revolution of 1848. It offers new...

Preussens Zensurpraxis Von 1819 Bis 1848 in Quellen

By Barbel Holtz

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Preussens Zensurpraxis Von 1819 Bis 1848 in Quellen

By Barbel Holtz

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Preussens Pressepolitik Zwischen Abschaffung der Zensur und Reichspressgesetz 1848 Bis 1874

By Barbel Holtz

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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.