Michael Welder Books

Der Beginn einer Epoche.

By Michael Welder

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Reise nach Danzig. Auf Spurensuche in Westpreussen und zur Konigin der Ostsee .

By Michael Welder

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Reise Nach Königsberg. Spurensuche Von Litauen In Das Nördliche Ostpreußen.

By Michael Welder, Nicholas G. Hall

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This article concerns the scheduling of n jobs around a common due date, so as to minimize the average total earliness plus total lateness of the jobs. Optimality conditions for the problem are dev...

Reise nach Masuren. Spurensuche in Ostpreussen Westpreussen und Danzig.

By Michael Welder, Rudolf Meitsch

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Reise nach Schlesien. Auf Spurensuche zwischen Annaberg und Zobten.

By Michael Welder

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Schones Schlesien. Perle des Ostens.

By Michael Welder

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Reise nach Masuren

By Michael Welder

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Reise nach Schlesien

By Michael Welder

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Reise nach Konigsberg

By Michael Welder

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Museum Stadt Konigsberg in Duisburg

By Michael Welder

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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.