Urs Leu Books

Conrad Gesner als Theologe
Conrad Gesner als Theologe

By Urs B. Leu

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Die Pflicht zur Ersatzteillieferung beim Kauf von hochwertigen Konsumgutern
Europe in the Renaissance
Europe in the Renaissance

By Erika Hebeisen, Bernard Aikema

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The Renaissance experienced some of the most important advances in human history: the invention of the printing press using movable letters, the discovery of an unknown continent, and the formulati...

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Europe in the Renaissance
Europe in the Renaissance

By Erika Hebeisen, Bernard Aikema

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The Renaissance experienced some of the most important advances in human history: the invention of the printing press using movable letters, the discovery of an unknown continent, and the formulati...

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Conrad Gessner
Conrad Gessner

By Urs Leu, Peter Opitz

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Conrad Gessner
Conrad Gessner

By Urs Leu, Peter Opitz

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Conrad Gessner
Conrad Gessner

By Urs Leu, Peter Opitz

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Conrad Gessner s private library
Conrad Gessner s private library

By Urs B. Leu

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An annotated library catalog.

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Huldrych Zwingli s Private Library
Conrad Gessner s Private Library

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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.

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