Thomas Hartner Books

Jacob
Jacob

By Jack Bernard, Thomas Hartner, Sven Hartmann

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A cat explains how he acquired and trained his Human and describes the happiness his Human brings him.

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Jacob 2 Jacob
Jacob 2 Jacob

By Thomas Hartner, Sven Hartmann

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Jacob A Cat s Best Friend
Jacob A Cat s Best Friend

By

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Der liebe bose Joos. WDR Horspiel Hochspannung. Cassette.
Das Grauen grusst herzlich! manchmal auch spat
Bei Vollmond, immer ...
Bei Vollmond, immer ...

By Thomas Hartner

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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.

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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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