Les Johnson Books

Interstellar Travel
Interstellar Travel

By Les Johnson, Kenneth Roy

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Interstellar Travel
Interstellar Travel

By Les Johnson, Kenneth Roy

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Interstellar Travel
Interstellar Travel

By Les Johnson, Kenneth Roy

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Paradise Regained
Paradise Regained

By Les Johnson

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Paradise Regained
Paradise Regained

By Les Johnson

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Solar Sails
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...

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Back to the moon
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...

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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.

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