Erich Karkoschka Books

This sky atlas contains star charts and information for all those who observe the night sky with the naked eye, binoculars, or a small telescope, or who just wish to look at constellations and inte...

Observer'S Sky Atlas

By Erich Karkoschka

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The Observer'S Sky Atlas: With 50 Star Charts Covering The Entire Sky

By Erich Karkoschka

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The Observer's Sky Atlas is a wonderful little atlas in concept and, for the most part, in execution. The book was written by a professional planetary astronomer and offers useful star charts on od...

Observer s Sky Atlas

By Erich Karkoschka

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Autonomous Systems - Self-Organization, Management, and Control

By B. Mahr

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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.