Christian Gugl Books

Archaologische Forschungen in Teurnia: Die Ausgrabungen in den Wohnterrassen 1971-1978. Die latenezeitlichen Funde vom Holzer Berg

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The Claudian-era Municipium Teurnia, today's St. Peter in Holz, is situated four kilometers west of Spittal an der Drau (Carinthia, Austria). Along with Virunum, Celeia, luvavum and Aguntum, Teurni...

Die romischen Fibeln aus Virunum

By Christian Gugl

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Feldkirchen in Karnten

By Alfred Galik

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Virunum

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Legionslager Carnuntum

By Raimund Kastler, Michael Doneus, Christian Gugl

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Die Canabae von Carnuntum II

By Christian Gugl

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The Carnuntum canabae legionis holds a special place in the category of the civilian suburbs of Roman fortresses. An overall plan of the canabae now exists, thanks to the intensification of aerial-...

Strassen und Platze

By Martin Mosser, Ingeborg Gaisbauer

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From the contents: Straßenerschließung in der südlichen Vorstadt der Colonia Claudia Ara Agrippinensium - Köln / Dendrochronologie der römerzeitlichen Holzfunde vom Waidmarkt in Köln / Das römische...

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.