Rene Ployer Books

The frontiers of the Roman Empire

By Rene Ployer

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Frontiers of the Roman Empire the Danube Limes in Austria Grenzen des Romischen Reiches

By David J. Breeze, Andreas Schwarcz, Rene Ployer

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Frontiers of the Roman Empire the Danube Limes in Austria Grenzen des Romischen Reiches

By David J. Breeze, Andreas Schwarcz, Rene Ployer

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Magnis itineribus

By Rene Ployer, Dieta Svoboda Baas

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Die Publikation 'Magnis itineribus' vereint in 26 Beiträgen, deren Bogen sich von der archaischen Zeit bis in die Gegenwart erstreckt, die vielfältigen Themenbereiche, welche die weitgestreckten In...

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.