Les Johnson Books

Interstellar Travel

By Les Johnson, Kenneth Roy

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Interstellar Travel

By Les Johnson, Kenneth Roy

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Interstellar Travel

By Les Johnson, Kenneth Roy

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Solar Sails

By Giovanni Vulpetti, Les Johnson, Gregory Matloff

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"The first part of this book describes our heritage of exploration in water-borne sailing ships, then moves quickly into the details of space-vehicle propulsion. Space sailing, the authors point ou...

Traveler s Guide to the Stars

By Les Johnson

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Traveler s Guide to the Stars

By Les Johnson

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Traveler s Guide to the Stars

By Les Johnson

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Back to the moon

By Travis S. Taylor

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As a U.S. mission to the Moon prepares to lift off decades after the 1969 lunar mission, a secret Chinese trip to the Moon is revealed when a distress signal is received, prompting the U.S. team to...

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.