Brian Warner Books

Expert Twisted Event Driven and Asynchronous Programming with Python

By Mark Williams

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Royal Observatory Cape of Good Hope 1820 1831

By Brian Warner

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Royal Observatory Cape of Good Hope 1820 1831

By Brian Warner

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The Royal Observatory, Cape of Good Hope, was the first major astronomical observatory in the southern hemisphere, and this volume presents a comprehensive account of its origin, construction and u...

A Practical Guide to Lightcurve Photometry and Analysis Patrick Moore s Practical Astronomy Series

By Brian D. Warner

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Practical Guide to Lightcurve Photometry and Analysis

By Brian Warner, Alan W. Harris

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Cataclysmic Variable Stars

By Brian Warner

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Cataclysmic Variable Stars

By Brian Warner

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Hamlet

By Brian Warner

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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.