Gerd De Ley Books

Dictionary of Wit and Wisdom
Dictionary of Wit and Wisdom

By Gerd De Ley

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Erotic Wit
Erotic Wit

By Gerd De Ley

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Do Unto Others...Then Run
International dictionary of proverbs
Dictionary of 1000 Dutch Proverbs Hippocrene Bilingual Proverbs Hippocrene Bilingual Proverbs
International dictionary of proverbs
African Proverbs
African Proverbs

By Gerd De Ley

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It Costs Money To Sin
Cowboy Wisdom
Cowboy Wisdom

By Gerd De Ley

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An inspiring collection of over 200 favorite quotations about the Old West.From Roy Rogers to Will Rogers, Gene Autry to John Wayne, cowboys have always been a part of America. Now, Cowboy Wisdom c...

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Jewish wisdom
Jewish wisdom

By David Potter, Gerd De Ley

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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.

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