Friedrich Heer Books

The Fires of faith

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Traces milestones of history from Constantine's unification of the western half of the Roman Empire under his name in 312 to the fall of Constantinople in 1204.

The Fires of faith

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Traces milestones of history from Constantine's unification of the western half of the Roman Empire under his name in 312 to the fall of Constantinople in 1204.

Europa unser

By Friedrich Heer

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Scheitern in Wien

By Friedrich Heer

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Das Wagnis der schopferischen Vernunft

By Friedrich Heer

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Der Kampf um die osterreichische Identitat

By Friedrich Heer

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Der Kampf um die osterreichische Identitat.

By Friedrich Heer

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Ausgesprochen

By Friedrich Heer

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Kampf um die osterreichische Identitat

By Friedrich Heer

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Dunkle Mutter Wien, mein Wien

By Friedrich Heer

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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.