Holger Gast Books

How to Use Objects: Code and Concepts

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While most developers today use object-oriented languages, the full power of objects is available only to those with a deep understanding of the object paradigm. How to Use Objects will help you ga...

Katholische Missionsschulen in Deutschland 1887 1940

By Uwe Sandfuchs, August H. Leugers Scherzberg, Antonia Leugers, Holger Gast

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How to Use Objects

By Holger Gast

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How to Use Objects

By Holger Gast

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Softwarearchitektur Fur Dummies

By Holger Gast

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Softwarearchitektur Fur Dummies

By Holger Gast

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Optimierung historischer Forschung durch Datenbanken

By August H. Leugers Scherzberg, Antonia Leugers, Holger Gast

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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.