Donald E. Osterbrock Books

Yerkes Observatory 1892 1950

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Donald E. Osterbrock tells the story of Yerkes Observatory; built a century ago by the University of Chicago as one of America's first big-science centers. Financed by robber baron Charles T. Yerke...

Origins and extinctions

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Origins and Extinctions

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Eye on the sky

By Donald E. Osterbrock

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James E. Keeler: Pioneer American Astrophysicist: And the Early Development of American Astrophysics

By Donald E. Osterbrock

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James E. Keeler Pioneer American Astrophysicist

By Donald E. Osterbrock

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Walter Baade

By Donald E. Osterbrock

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"Although less well known outside the field than Edwin Hubble, Walter Baade was arguably the most influential observational astronomer of the twentieth century. Written by a fellow astronomer deepl...

Astrophysics of gaseous nebulae

By Donald E. Osterbrock

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Stars and galaxies

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Pauper & prince

By Donald E. Osterbrock

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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.