John R. Gustafson Books

Eye on the sky

By Donald E. Osterbrock

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Stars clusters and galaxies

By John R. Gustafson

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Describes stars and groups of stars and explains how they are formed, why they shine, and how to find them in the sky.

Stars, clusters, and galaxies

By John R. Gustafson

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Describes stars and groups of stars and explains how they are formed, why they shine, and how to find them in the sky.

Eye on the Sky

By John R. Gustafson, Shiloh Unruh, Donald E. Osterbrock

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Planets, moons, and meteors

By John R. Gustafson

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Describes planets, moons, meteors, and other objects in the solar system and how to find them with the naked eye, binoculars, or a telescope.

Planets, moons, and meteors

By John R. Gustafson

Average: 0.00, 0 Ratings

Describes planets, moons, meteors, and other objects in the solar system and how to find them with the naked eye, binoculars, or a telescope.

Stars, clusters, and galaxies

By John R. Gustafson

Average: 0.00, 0 Ratings

Describes stars and groups of stars and explains how they are formed, why they shine, and how to find them in the sky.

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.